1.

\(x^4-6x^2-12x-8=0\)

\(\Leftrightarrow x^4-2x^2+1-4x^2-12x-9=0\)

\(\Leftrightarrow\left(x^2-1\right)^2=\left(2x+3\right)^2\)

\(\Leftrightarrow\left[{}\begin{matrix}x^2-1=2x+3\\x^2-1=-2x-3\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x^2-2x-4=0\\x^2+2x+2=0\end{matrix}\right.\)

\(\Leftrightarrow x=1\pm\sqrt{5}\)

3.

ĐK: \(x\ge-9\)

\(x^4-x^3-8x^2+9x-9+\left(x^2-x+1\right)\sqrt{x+9}=0\)

\(\Leftrightarrow\left(x^2-x+1\right)\left(\sqrt{x+9}+x^2-9\right)=0\)

\(\Leftrightarrow\sqrt{x+9}+x^2-9=0\left(1\right)\)

Đặt \(\sqrt{x+9}=t\left(t\ge0\right)\Rightarrow9=t^2-x\)

\(\left(1\right)\Leftrightarrow t+x^2+x-t^2=0\)

\(\Leftrightarrow\left(x+t\right)\left(x-t+1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-t\\x=t-1\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-\sqrt{x+9}\\x=\sqrt{x+9}-1\end{matrix}\right.\)

\(\Leftrightarrow...\)

2.

ĐK: \(x\ne\dfrac{2\pm\sqrt{2}}{2};x\ne\dfrac{-2\pm\sqrt{2}}{2}\)

\(\dfrac{x}{2x^2+4x+1}+\dfrac{x}{2x^2-4x+1}=\dfrac{3}{5}\)

\(\Leftrightarrow\dfrac{1}{2x+\dfrac{1}{x}+4}+\dfrac{1}{2x+\dfrac{1}{x}-4}=\dfrac{3}{5}\)

Đặt \(2x+\dfrac{1}{x}+4=a;2x+\dfrac{1}{x}-4=b\left(a,b\ne0\right)\)

\(pt\Leftrightarrow\dfrac{1}{a}+\dfrac{1}{b}=\dfrac{3}{5}\left(1\right)\)

Lại có \(a-b=8\Rightarrow a=b+8\), khi đó:

\(\left(1\right)\Leftrightarrow\dfrac{1}{b+8}+\dfrac{1}{b}=\dfrac{3}{5}\)

\(\Leftrightarrow\dfrac{2b+8}{\left(b+8\right)b}=\dfrac{3}{5}\)

\(\Leftrightarrow10b+40=3\left(b+8\right)b\)

\(\Leftrightarrow\left[{}\begin{matrix}b=2\\b=-\dfrac{20}{3}\end{matrix}\right.\)

TH1: \(b=2\Leftrightarrow...\)

TH2: \(b=-\dfrac{20}{3}\Leftrightarrow...\)

1) \(A=x^2+2x+2=\left(x+1\right)^2+1\ge1>0\left(\forall x\right)\)

2) \(B=x^2+6x+11=\left(x+3\right)^2+2\ge2>0\left(\forall x\right)\)

3) \(C=4x^2+4x-2=\left(2x+1\right)^2-2\ge-2\) chưa chắc nhỏ hơn 0

4) \(D=-x^2-6x-11=-\left(x+3\right)^2-2\le-2< 0\left(\forall x\right)\)

5) \(E=-4x^2+4x-2=-\left(2x-1\right)^2-1\le-1< 0\left(\forall x\right)\)

1. \(A=x^2+2x+2=\left(x+1\right)^2+1\)

Vì \(\left(x+1\right)^2\ge0\forall x\)\(\Rightarrow\left(x+1\right)^2+1\ge1\)

=> Đpcm

2. \(B=x^2+6x+11=\left(x+3\right)^2+2\)

Vì \(\left(x+3\right)^2\ge0\forall x\)\(\Rightarrow\left(x+3\right)^2+2\ge2\)

=> Đpcm

3. \(C=4x^2+4x-2=-\left(4x^2-4x+2\right)\)

\(=-\left(4\left(x-\frac{1}{2}\right)^2+1\right)\)

Vì \(\left(x-\frac{1}{2}\right)^2\ge0\forall x\Rightarrow4\left(x-\frac{1}{2}\right)^2+1\ge1\)

\(\Rightarrow-\left(4\left(x-\frac{1}{2}\right)^2+1\right)\le1\)

=> Đpcm

4,5 làm tương tự

\(1.A=x^2+2x+2=\left(x+1\right)^2+1\)

Vì\(\left(x+1\right)^2\ge0\forall x\)

\(\Rightarrow\left(x+1\right)^2+1\ge1\forall x\)

hay\(\left(x+1\right)^2+1>0\forall x\)

\(2.B=x^2+2x.3+9+2=\left(x+3\right)^2+2\)

CM tương tự A

\(3.C=4x^2+4x-2=\left(2x+1\right)^2-2\)

Vì\(\left(2x+1\right)^2\ge0\forall x\)

\(\Rightarrow\left(2x+1\right)^2-2\ge-2\forall x\)(có thể >0)

4,5 Cm tương tự

1 ) \(A=\left(\dfrac{2x^3+2}{x+1}-2x\right)\left(\dfrac{x^3-1}{x-1}+x\right)\)

\(\Leftrightarrow A=\left(\dfrac{2x^3+2-2x^2-2x}{x+1}\right)\left(x^2+2x+1\right)\)

\(\Leftrightarrow A=\left(\dfrac{\left(2x^2-2\right)\left(x-1\right)}{x+1}\right)\left(x+1\right)^2\)

\(\Leftrightarrow A=\left(\dfrac{2\left(x-1\right)\left(x+1\right)\left(x-1\right)}{x+1}\right)\left(x+1\right)^2\)

\(\Leftrightarrow A=2\left(x-1\right)^2\left(x+1\right)^2\ge0\forall x\)

1/ 

a, (x-3)²+(4+x)(4-x)=10

<=>x²-6x+9+(16-x²)=10

<=>-6x+25=10

<=>-6x=-15

<=>x=5/2

còn lại tương tự a 

2/

a, \(a^2\left(a+1\right)+2a\left(a+1\right)=\left(a^2+2a\right)\left(a+1\right)=a\left(a+1\right)\left(a+2\right)\)

Vì a(a+1)(a+2) là tích 3 nguyên liên tiếp nên a(a+1)(a+2) chia hết cho 2,3

Mà (2,3)=1

=>a(a+1)(a+2) chia hết cho 6 (đpcm)

b, \(x^2+2x+2=\left(x^2+2x+1\right)+1=\left(x+1\right)^2+1\)

Vì \(\left(x+1\right)^2\ge0\Rightarrow\left(x+1\right)^2+1\ge1>0\left(đpcm\right)\)

c, \(x^2-x+1=\left(x^2-x+\frac{1}{4}\right)+\frac{3}{4}=\left(x-\frac{1}{2}\right)^2+\frac{3}{4}\)

Vì \(\left(x-\frac{1}{2}\right)^2\ge0\Rightarrow\left(x-\frac{1}{2}\right)^2+\frac{3}{4}\ge\frac{3}{4}>0\)(đpcm)

d, \(-x^2+4x-5=-\left(x^2-4x+4\right)-1=-\left(x-2\right)^2-1\)

Vì \(-\left(x-2\right)^2\le0\Rightarrow-\left(x-2\right)^2-1\le-1< 0\) (đpcm)

g,\(-4\left(x-1\right)^2+\left(2x+1\right)\left(2x-1\right)=-3\)

\(\Leftrightarrow-4\left(x^2-2x+1\right)+4x^2-1=-3\)

\(\Leftrightarrow-4x^2+8x-4+4x^2-1=-3\)

\(\Leftrightarrow8x=2\)

\(\Leftrightarrow x=\frac{1}{4}\)

bn xem lại đi nha

Vì dài quá nên mình chỉ có thể trả lời được mấy câu thôi

Bài 1:

27x³ - 8 : (6x + 9x² +4)

= (3x - 2) (9x² + 6x + 4) : (9x² + 6x + 4)

= 3x - 2

Bài 3:

a, 81x⁴ + 4 = (9x²)² + 36x² + 4 - 36x²

= (9x² + 2)² - (6x)²

= (9x² + 6x + 2)(9x² - 6x + 2)

b, x² + 8x + 15 = x² + 3x + 5x + 15

= x(x + 3) + 5(x + 3)

= (x + 3)(x + 5)

c, x² - x - 12 = x² + 3x - 4x - 12

= x(x + 3) - 4(x + 3)

= (x + 3) (x - 4)

Câu 1:

(27x³ - 8) : (6x + 9x² + 4)

= (3x - 2)(9x² + 6x + 4) : (6x + 9x² + 4)

= 3x - 2

Câu 2:

a) (3x - 5)(2x+ 11) - (2x + 3)(3x + 7)

= 6x² + 33x - 10x - 55 - 6x² - 14x - 9x - 21

= -76

⇒ đccm

b) (2x + 3)(4x² - 6x + 9) - 2(4x³ - 1)

= 8x³ + 27 - 8x³ + 2

= 29

⇒ đccm

Câu 3:

a) 81x⁴ + 4

= (9x²)² + 2²

= (9x² + 2)² - (6x)²

= (9x² - 6x + 2)(9x² + 6x + 2)

b) x² + 8x + 15

= x² + 3x + 5x + 15

= x(x + 3) + 5(x + 3)

= (x + 3)(x + 5)

c) x² - x - 12

= x² - 4x + 3x - 12

= x(x - 4) + 3(x - 4)

= (x - 4)(x + 3)

Câu 4:

a) 2x(x - 5) - x(3 + 2x) = 26

⇔ 2x² - 10x - 3x - 2x² = 26

⇔ - 13x = 26

⇔ x = -2

b) 5x(x - 1) = x - 1

⇔ 5x = 1

⇔ x = \(\dfrac{1}{5}\)

c) 2(x + 5) - x² - 5x = 0

⇔ 2( x + 5) - x(x + 5) = 0

⇔ (x + 5)(2 - x) = 0

⇔ x + 5 = 0 hoặc 2 - x = 0

⇔ x = -5 hoặc x = 2

d) (2x - 3)² - (x + 5)² = 0

⇔ (2x - 3 - x - 5)(2x - 3 + x + 5) = 0

⇔ (x - 8)(3x + 2) = 0

⇔ x - 8 = 0 hoặc 3x + 2 = 0

⇔ x = 8 hoặc x = \(\dfrac{-2}{3}\)

e) 3x³ - 48x = 0

⇔ 3x(x² - 16) = 0

⇔ 3x = 0 hoặc x² - 16 = 0

⇔ x = 0 hoặc x = 4 hoặc x = -4

Bài 1:

a)-x^2+4x-5

=-(x²-4x+5)<0 với mọi x

=>-x^2+4x-5<0 với mọi x

b)x^4+3x^2+3

\(=\left(x^2+\frac{3}{2}\right)^2+\frac{3}{4}>0\)với mọi x

=>x^4+3x^2+3>0 với mọi x

c) bn xét từng th ra

Bài 2:

a)9x^2-6x-3=0

=>3(3x²-2x-1)=0

=>3x²-2x-1=0

=>3x²+x-3x-1=0

=>x(3x+1)-(3x+1)=0

=>(x-1)(3x+1)=0

b)x^3+9x^2+27x+19=0

=>(x+1)(x²+8x+19) (dùng pp nhẩm nghiệm rồi mò ra)

c)x(x-5)(x+5)-(x+2)(x^2-2x+4)=3

=>x³-25x-x³-8=3

=>-25x-8=3

=>-25x=1

=>x=-11/25

mk sửa 1 tí ở dấu => thứ 2 từ dưới lên là

=>-25x=11

\(f'=6x^8-6x^5+6x+6=6\left(x^8-x^5+x+1\right)\)

\(\left[{}\begin{matrix}\left|x\right|\le1\Rightarrow\left|x^5-x\right|\le\left|x\right|\le1\Rightarrow1-x^5-x\ge0\\\left|x\right|\ge1\Rightarrow\left|x^5\right|\le x^8\Rightarrow\left\{{}\begin{matrix}x^8-x^5>0\\x^2-x>0\end{matrix}\right.\end{matrix}\right.\) \(\Rightarrow f'\left(x\right)>0\forall x\)

Bài 1.

a) ( 7x - 3 )² - 5x( 9x + 2 ) - 4x² = 18

<=> 49x² - 42x + 9 - 45x² - 10x - 4x² = 18

<=> -52x + 9 = 18

<=> -52x = 9

<=> x = -9/52 

b) ( x - 7 )² - 9( x + 4 )² = 0

<=> x² - 14x + 49 - 9( x² + 8x + 16 ) = 0

<=> x² - 14x + 49 - 9x² - 72x - 144 = 0

<=> -8x² - 86x - 95 = 0 

<=> -8x² - 10x - 76x - 95 = 0

<=> -8x( x + 5/4 ) - 76( x + 5/4 ) = 0

<=> ( x + 5/4 )( -8x - 76 ) = 0

<=> \(\orbr{\begin{cases}x+\frac{5}{4}=0\\-8x-76=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=-\frac{5}{4}\\x=-\frac{19}{2}\end{cases}}\)

c) ( 2x + 1 )² + ( 4x - 1 )( x + 5 ) = 36

<=> 4x² + 4x + 1 + 4x² + 19x - 5 = 36

<=> 8x² + 23x - 4 - 36 = 0

<=> 8x² + 23x - 40 = 0

=> Vô nghiệm ( lớp 8 chưa học nghiệm vô tỉ nghen ) :))

Bài 2.

a) x² - 12x + 39 = ( x² - 12x + 36 ) + 3 = ( x - 6 )² + 3 ≥ 3 > 0 ∀ x ( đpcm )

b) 17 - 8x + x² = ( x² - 8x + 16 ) + 1 = ( x - 4 )² + 1 ≥ 1 > 0 ∀ x ( đpcm )

c) -x² + 6x - 11 = -( x² - 6x + 9 ) - 2 = -( x - 3 )² - 2 ≤ -2 < 0 ∀ x ( đpcm )

d) -x² + 18x - 83 = -( x² - 18x + 81 ) - 2 = -( x - 9 )² - 2 ≤ -2 < 0 ∀ x ( đpcm )