Question

Tìm x

(4x+5)(x-2)-(2x+3)²=6

5x(4-3x)-3x+4=0

MIK ĐANG CẦN GẤP

GIẢI CHI TIẾT
 

Answer 1

`a, <=> 4x^2 - 3x - 10 - 4x^2 - 12x - 9 = 6`

`<=> -15x -25 = 0`

`<=> x = -5/3`

`b, 20x - 15x^2 - 3x + 4 =0`

`<=> -15x^2 + 17x + 4 = 0``

`=>` \(\left[{}\begin{matrix}x=\dfrac{4}{3}\\x=-\dfrac{1}{5}\end{matrix}\right.\)

Answer 2

a: \(\Leftrightarrow4x^2-8x+5x-10-4x^2-12x-9=6\)

=>-15x-19=6

=>-15x=25

hay x=-5/3

b: \(\Leftrightarrow\left(4-3x\right)\left(5x+1\right)=0\)

=>x=4/3 hoặc x=-1/5