(X-5)^2-x(x+3)=-14
(X-3)^2+5x-15=0
4x(x-2)=(2x-5)(2x+5)-7
X^2-6x+9=7(3-x)
^là mũ nha mn
(X-5)^2-x(x+3)=-14 (X-3)^2+5x-15=0 4x(x-2)=(2x-5)(2x+5)-7 X^2-6x+9=7(3-x) ^là mũ nha mn
By Ivy
By Ivy
(X-5)^2-x(x+3)=-14
(X-3)^2+5x-15=0
4x(x-2)=(2x-5)(2x+5)-7
X^2-6x+9=7(3-x)
^là mũ nha mn
Đáp án:
Giải thích các bước giải:
2/ (x – 3)^2 + 5x – 15 = 0
(x – 3)^2 + 5.(x – 3) = 0
(x – 3).(x + 2) = 0
⇒ x – 3 = 0 or x + 2 = 0
* x – 3 = 0 * x + 2 = 0
x = 3 x = -2
Vậy x = 3; x = -2
2/ (x – 3)^2 + 5x – 15 = 0
(x – 3)^2 + 5.(x – 3) = 0
(x – 3).(x + 2) = 0
⇒ x – 3 = 0 or x + 2 = 0
* x – 3 = 0 * x + 2 = 0
x = 3 x = -2
Vậy x = 3; x = -2