Question

(-3x+4) (-4X-5)+ 4x = -20
(-5x + 2) (-5x - 2) + 4 x = -4.​

Answer 1

Ответ:

1)(-3x+4) (-4x-5)+ 4x = -20

12x^2+15x-16x+4x=0

12x^2+3x=0

$x = frac{ - 3 + 3}{24}$

$x = frac{ - 3 - 3}{24}$

x=0

$x = frac{1}{4}$

2)(-5x + 2) (-5x - 2) + 4 x = -4.

25x^2-4+4x=-4

25x^2+4x=0

x=0

$x = - frac{4}{25}$