a. x2 - 6x = -9
<=> x2 - 6x + 9 = 0
<=> (x - 3)2 = 0
<=> x - 3 = 0
<=> x = 3
b. 2(x + 3) - x2 + 3x = 0
<=> 2(x + 3) - x(x + 3) = 0
<=> (2 - x)(x + 3) = 0
<=> \(\left[{}\begin{matrix}2-x=0\\x+3=0\end{matrix}\right.\)
<=> \(\left[{}\begin{matrix}x=2\\x=-3\end{matrix}\right.\)
tim x
a)4x(x-7)-4x2=56
b)12x(3x-2)-(4-6x)=0
c)4(x-5)-(5-x)2=0
Tìm x
a) 3x(4x - 3) - 2x(5 - 6x) = 0
b) 5(2x - 3) + 4x(x - 2) + 2x(3 - 2x) = 0
c) 3x(2 - x) + 2x(x - 1) = 5x(x + 3)
d) 3x (x + 1) - 5x(3 - x) + 6(x^2 + 2x + 3) = 0
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
Bài 4: Tìm x, biết.
a) 4x(x - 7) - 4x2 = 56
b) 12x(3x - 2) - (4 - 6x) = 0
c) 4(x - 5) - (5 - x)2 = 0
d) x(x +1) - x(x - 3) = 0
e) - 6x + 8 = 0 f) 2 + 2x + = 0
bài 1 tìm x
a)6x^2-72x=0
b)-2x^4+16x=0
c)x(x-5)-(x-3)^2=0
d)(x-2)^3-(x-2)(x^2+2x+4)=0
Tìm x:
a)(x-1)^2+x(5-x)=8
b)x^3-3x^2+x-3
c)(12x^4-6x):6x+2x(2+x)(2-x)=7
Tìm x biết:
a/ x2 - 6x = 0 b/ ( 3x – 1)2 – ( x + 5)2 = 0
c/ 9x2 ( x- 1) = x – 1 d/ x2 – 4 = ( x – 2)2
e/ x + 3 – ( x + 3)2 =0 f/ x3 – 0,36x = 0
g/ 5x( x- 2018) – x + 2018 = 0 h/ x( x- 5) – 4x + 20 = 0
tìm x
a(14x^3+12x^2-14x):2x=(x+2)(3x-4)
b(4x−5)(6x+1)−(8x+3)(3x−4)=15
tìm x biết
a/ (x - 4)(x + 4)- x(x + 2)=0
b/ 3x(x - 2)- x + 2 = 0
c/ 6x - 12x2 = 0
d/ 4x(3 - x)+(x - 2)(x + 2)= 0
