\(\Leftrightarrow x^3+8x^2+16x-x^3+9x^2-27x+27-x^2+2x=4\)
\(\Leftrightarrow16x^2-9x+23=0\)
hay \(x\in\varnothing\)
Tìm x biết :
a) \(\left(x-2\right)^3+6\left(x+1\right)^2-x^3+12=0\)
b) \(\left(x-5\right)\left(x+5\right)-\left(x+3\right)^3+3\left(x-2\right)^2=\left(x+1\right)^2-\left(x+4\right)\left(x-4\right)+3x^2\)
c) \(\left(2x+3\right)^2+\left(x-1\right)\left(x+1\right)=5\left(x+2\right)^2-\left(x-5\right)\left(x+1\right)+\left(x+4\right)^2\)
d) \(\left(1-3x\right)^2-\left(x-2\right)\left(9x+1\right)=\left(3x-4\right)\left(3x+4\right)-9\left(x+3\right)^2\)
Bài 3: Tìm x
1) ( x + 5)2 = (x + 3)( x – 7)
2) (x + 2)(x2 -2x + 4) = 15 + x(x2 +2)
3) x2 + 6x = -9
4) x3 - 9x2 = 27 – 27x
5) (2x + 1)2 - 4(x + 2)2 = 9
6) –x2 - 2x +15 = 0
Tìm x biết: (x + 4)(x − 4) − x\(^2\) + 3x = 5.
A. x = 7
B. x = 1
C. x = −7
D. x = 3
Tìm x:
a, (x-3).(x-1)=(x-3)\(^2\)
b, (4\(x^2\)-9)=0
c, x\(^2\)+6x+9=0
Mong m.n giúp
tìm x, biết :
a) (x - 2)2 -(x + 3)2 -4( x + 1) =5
Câu 4.Tìm x, biết 5x(x − 3) − 5x\(^2\) = 45
A. x = 0
B. x = 1
C .x = −3
D. x = 2
2 . ( x³ -1)-2x²(x+2x⁴) +(4x⁵+4)x=6. 3. (X²-4x+16)(x+4)-x(x+1)(x+2)+3x²= 0 4 . ( 8x +2 ) (1-3x) + ( 6x-1)(4x-10) =-50 Đề bài là tìm x nha mn Nhanh giúp mik vs
Bài 1:Tìm x
1,x.(1-6.x)-6.x.(4-x)=46
2,(3.x-2).(3.x+2)-9.(x-2)2=20
3,x.(x3+3.x-4)-(x4+3x2)=20
4,x.(2.x-3)+2.x.(1-x)=9
5,x.(12.x-3)-12.x.(x-2)=54
Bài 1: Áp dụng những hằng đẳng thức để tìm x
a) -(x+3)(x-4)+(x+1)(x-1)=10
b) (2x-1)(x-2)-(x+3)(2x-7)=3
c) (x-5)(4-x)-(x-1)(x+3)=-2x
d) 3(x+7)(x-7)-(x-1)(3x+2)=13
e) 5(x-3)(x-7)-(5x+1)(x-2)=8
f) (3x-4)(x-2)=3x(x-9)-10
g) 5x(x-3)=(x-2)(5x-1)-5
h) 6(x-3)(x-4)-6x(x-2)=4
i) (x-2)(x+3)-(x+4)(x-7)=5-x
k) (4x-5)(x+1)-4(x-1)(x+1)=7
l) (3x-4)(x-2)=3x(x-9)-3
