a: \(x^2-4x=0\)
=>x(x-4)=0
=>\(\left[{}\begin{matrix}x=0\\x-4=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=4\end{matrix}\right.\)
b: \(\left(2x+1\right)^2-4x\left(x+3\right)=9\)
=>\(4x^2+4x+1-4x^2-12x=9\)
=>-8x=9-1=8
=>x=-1
c: \(x^2-12x=-36\)
=>\(x^2-12x+36=0\)
=>\(\left(x-6\right)^2=0\)
=>x-6=0
=>x=6
a, x2 - 4x = 0 b, (2x + 1)2 - 4x (x + 3) = 9
c, x2 -12x = -36
tìm x, biết:
a) 9x2+36=0
b) 3(x+4)-x2-4x=0
c) x(2x-1)-(x-2)(2x+1)=0
d) (2x-3)2-4x2=00
e)1 phần 3.x2-3x=0
f) x3-x2-x+1=0
ráng giúp mình nha
Tìm x biết.
a)(x+2)3-x2(x+6)=0
b) (2x+3)3-8x(x-1)(x+1)=9x(4x-3)
c)(2-x)3+(2+x)3-12x(x+1)=0
thực hiện phép tính
a) 5x(3x2-4x+2)
b)(x2-3x)(3x2-x+4)
2) tìm x biết
a) x3-6x2+12x=0
b)x3+9x2+27x+27=0
giúp mình mn ơi
Bài 3 : Tìm x biết
a) (x-2)^2-x(x-3)=0
b) (x+3)(2x+1)-2(x-1)^2=0
c) (4x-5)^2=9(2-5x)^2
d) X^2-6x-13=0
e) (x+2)(x^2-2x+4)-x(x^2+2)=15
f) X^3-6x^2+12x-19=0
1. Rút gọn
a, A=(4x+3y)2 + (4x-3y)2
b,B=(x-23)-(x+2)3
c,C=(x+2y)2+2.(x+2y) (x-2y) + (x-2y)2
2. Tìm x
a, x2+12x+36=0
b,16x2-8x+1=0
c,x3+3x2+3x+1=0
1. Rút gọn
a, A=(4x+3y)2 + (4x-3y)2
b,B=(x-23)-(x+2)3
c,C=(x+2y)2+2.(x+2y) (x-2y) + (x-2y)2
2. Tìm x
a, x2+12x+36=0
b,16x2-8x+1=0
c,x3+3x2+3x+1=0
Tìm x
a, 3/4x*(x2-9)=0
b, x3-16x=0
c, (x-1)(x+2)-x-2=0
d, 3x3-27x=0
e, x2(x+1)+2x(x+1)=0
f, x(2x-3)-2(3-2x)=0
tìm x biết:
a, 4x2 4x + 1 = 0
b, (x - 1) (x2 + x + 1) - x (x2 + 1) = 4
c, (2x - 1)3 + (x+2)3 - 9 (x + 1) (x - 1) x = 7
Tìm x biết:
a, 16x² – 9(x + 1)²= 0
b, x2 (x – 1) – 4x2 + 8x – 4 = 0
c, x(2x – 3) – 2(3 – 2x) = 0
d, (x – 3)(x² + 3x + 9) – x(x + 2)(x – 2) = 1
e, 4x² + 4x – 6 = 2
f, 2x² + 7x + 3 = 0
