\(4x^2-25y^2\)

\(\left(2x\right)^2-\left(5y\right)^2\)

\(\left(2x-5y\right)\left(2x+5y\right)\)

chọn c

a) x⁴ - 4x² + 4x - 1

= ( x²)² - [ ( 2x)² - 2.2x + 1]

= ( x²)² - ( 2x - 1)²

= ( x² - 2x +1)( x² + 2x - 1)

= ( x -1)²( x² + 2x - 1)

b) 4x² - y² + 4x + 1

= (2x)² + 2.2x +1 - y²

= ( 2x +1)² - y²

= ( 2x + 1 - y)( 2x + 1 + y)

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

\(\text{b) }4x^2-y^2+4x+1\\ \\=\left(4x^2+4x+1\right)-y^2\\ \\=\left(2x+1\right)^2-y^2\\ \\=\left(2x+1+y\right)\left(2x+1-y\right)\)

a) Ta có: \(8x^2+30x+7\)

\(=8x^2+28x+2x+7\)

\(=4x\left(2x+7\right)+\left(2x+7\right)\)

\(=\left(2x+7\right)\left(4x+1\right)\)

b) Ta có: \(4x^3-12x^2+9x\)

\(=x\left(4x^2-12x+9\right)\)

\(=x\left(2x-3\right)^2\)

c) Ta có: \(\left(2x+1\right)^2-\left(x-1\right)^2\)

\(=\left(2x+1-x+1\right)\left(2x+1+x-1\right)\)

\(=\left(x+2\right)\cdot3x\)

d) Ta có: \(ab+c^2-ac-bc\)

\(=\left(ab-bc\right)+\left(c^2-ac\right)\)

\(=b\left(a-c\right)+c\left(c-a\right)\)

\(=b\left(a-c\right)-c\left(a-c\right)\)

\(=\left(a-c\right)\left(b-c\right)\)

e) Ta có: \(4x^2-y^2+1-4x\)

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

\(=\left(2x-1\right)^2-y^2\)

\(=\left(2x-1-y\right)\left(2x-1+y\right)\)

f) Ta có: \(6x^2-7x-20\)

\(=6x^2-15x+8x-20\)

\(=3x\left(2x-5\right)+4\left(2x-5\right)\)

\(=\left(2x-5\right)\left(3x+4\right)\)

\(4x^3-12x^2+9x=x\left(4x^2-12x+9\right)=x\left(2x-3\right)^2\), \(\left(2x+1\right)^2-\left(x-1\right)^2=\left(2x+1-x+1\right)\left(2x+1+x-1\right)=\left(x+2\right)3x\)

\(ab+c^2-ac-bc=ab-ac-bc+c^2=a\left(b-c\right)-c\left(b-c\right)=\left(b-c\right)\left(a-c\right)\)

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

\(6x^2-7x-20=6x^2-15x+8x-20=3x\left(2x-5\right)+4\left(2x-5\right)=\left(2x-5\right)\left(3x+4\right)\)

\(8x^2+30x+7=8x^2+2x+28x+7=2x\left(4x+1\right)+7\left(4x+1\right)=\left(4x+1\right)\left(2x+7\right)\)

a) x³ + 4x² - 29x + 24                                                           

= x³ - 3x² + 7x² - 21x - 8x + 24

= x²(x-3) + 7x(x-3) - 8(x-3)

= (x-3)(x²+7x-8)

=(x-3)(x²+8x-x-8)

= (x-3)[(x²+8x)-(x+8)]

= (x-3)[x(x+8)-(x+8)]

= (x-3)(x+8)(x-1)

Câu b thì bạn kia làm đúng rồi nên mình chỉ giải câu a thôi nhé

\(3x^2+4x-7=\left(3x^2-3x\right)+\left(7x-7\right)\)

\(=\left(x-1\right)\left(3x+7\right)\)

a) = pp tìm nghiệm

     = (x -1)( x +7/3)

b) = (2x-1)² - 2² 

=(2x-1-2)(2x-1+2)

=(2x-3)(2x+1)

( ai cũng k hiu chi 1 vài ng gioi hiu)

\(1,a^2-b^2-12a+12b=\left(a-b\right)\left(a+b\right)-12\left(a-b\right)=\left(a-b\right)\left(a+b-12\right)\\ 2,4x^2-4x+1-25y^2=\left(2x-1\right)^2-\left(5y\right)^2=\left(2x-5y-1\right)\left(2x+5y-1\right)\\ c,x^2-3x-10=\left(x^2-5x\right)+\left(2x-10\right)=x\left(x-5\right)+2\left(x-5\right)=\left(x-5\right)\left(x+2\right)\)

\(4x^2-25=4x^2-5^2=\left(4x-5\right)\left(4x+5\right)\)

\(4x^2-25=\left(2x\right)^2-5^2=\left(2x-5\right)\left(2x+5\right)\)

mk nhầm chút, \(4x^2-25=\left(2x\right)^2-5^2=\left(2x-5\right)\left(2x+5\right)\) nhé,bn Nguyễn Thu Giang làm đúng r nhé

Ta có tổng quát: \(\left(ax^2+bx+c\right)\)\(\left(mx^2+nx+p\right)\)\(\circledast\)

-Nhân ra ta được: \(amx^4+\left(an+bm\right)x^3+\left(ap+bn+cm\right)x^2+\left(bp+cn\right)x+cp\)

-Áp dụng phương pháp hệ số bất định, ta có:

am=1

an+bm=4 (1)

ap+bn+cm=6 (2)

bp+cn=4 (3)

cp=5

-Xét a=m=1 và c=1, p=5

thay vào (1), ta được: n+b=4 (4)

thay vào (3), ta được: n+5b=4 (5)

từ (4),(5)\(\Rightarrow\)n=4 và b=0

giờ thay tất cả vào phương trình (3), ta được: 5+0+1=6 (T/M)

\(\Rightarrow\)Thay vào\(\circledast\), ta được: \(\left(x^2+1\right)\left(x^2+4x+5\right)\)

Cách 2: Ta tách \(6x^2\) thành \(5x^2+x^2\)

ta được: \(x^4+4x^3+5x^2+x^2+4x+5\)

\(\Leftrightarrow x^2\left(x^2+4x+5\right)+\left(x^2+4x+5\right)\)

\(\Leftrightarrow\left(x^2+1\right)\left(x^2+4x+5\right)\)