(x-3)(x+5) + x2 - 9 = 0
(x-3)(x+5) +(x-3)(x+3) = 0
( x-3) ( x+5 + x+3) = 0
(x-3)( 2x+8) =0
\(\left[{}\begin{matrix}x-3=0\\2x+8=0\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=3\\2x=-8\end{matrix}\right.\)
\(\left[{}\begin{matrix}x=3\\x=-4\end{matrix}\right.\)
Kl: \(x\in\) { -4; 3}
tìm x biết
a/ x^3-x^2-x+1=0
b/(2x^3-3)^2-(4x^2-9)=0
c/x^4+2x^3-6x-9=0
d/2(x+5)-x^2-5x=0
tìm x biết
a/ x^3-x^2-x+1=0
b/(2x^3-3)^2-(4x^2-9)=0
c/x^4+2x^3-6x-9=0
d/2(x+5)-x^2-5x=0
Tìm x , biết :
a, x mũ 2 - 2x + 1 = 25
b, 4 x mũ 2 - ( x + 4 ) mũ 2 = 0
c, 9 - 64 x mũ 2 = 0
d, 9 ( 4 x + 3 ) mũ 2 = 16 ( 3 x - 5 ) mũ 2
tìm x biết:
a)x^2-9-2(x-3)=0
b)x(x-5)-4x+20=0
c)2x^2+3x-5=0
Tìm x, biết :
a/ \(\dfrac{1}{3}x\left(x^2-4\right)=0\)
b/ \(x\left(x+5\right)=x+5\)
c/ \(x^3-\dfrac{1}{9}x=0\)
3)\(^2-\left(x+5\right)^2=0\)
e/ \(\left(x+2\right)^2-\left(x-2\right)\left(x+2\right)=0\)
f/ \(x\left(2x-3\right)-6+4x=0\)
g/ \(2\left(3x-2\right)^2-9x^2+4=0\)
h/ \(x^2\left(x+1\right)+2x\left(x+1\right)=0\)
i/ \(4x^2+9x+5=0\)
Tìm x biết :
a) x^2 - 3x + 2 (x-3) = 0
b) (x-1)(x+1) + x (x-9) = 2x^2 - 4
c) x (x-3) - 3x + 9 = 0
d) x (x+2) - (x-3)(x+3) = 5
đ) 2x (x+1) - (2x+1)(x-3) = 6
Tìm x, biết:
a) 3x(x - 1) + x - 1 = 0;
b) (x - 2)( x 2 + 2x + 7) + 2( x 2 - 4) - 5(x - 2) = 0;
c) ( 2 x - 1 ) 2 - 25 = 0;
d) x 3 + 27 + (x + 3)(x - 9) = 0.
Tìm x biết
x^3 + 6x^2 +12x= 19
5(x + 9)^2(x - 4)^3 - 10(x + 9)^3(x - 4)^2 = 0
(2x + 3)^2 + (x - 2)^2 - 2(2x +3 )(x - 2)
Tìm x biết 2(x+3)-x^2-3x=0
x^3+27+(x+3)(x-9)=0
4x^2-25-(2x-5)(2x+7)=0
8x^3-50x=0
(2x-1)^2-25=0
Tìm x biết:
a/ 2*(x+1)2 - (x-3)*(x+3) - (x-4) = 0
b/ (x-5)2 - x*(x-4) = 9
c/ (x-5)2 + (x-4)*(1-x) = 0
