Question

Resuelve estás ecuaciones :
x(x-1)=x2+4x+20

Answer 1

R// x= -4

$x(x - 1) = {x}^{2} + 4x + 20$

${x}^{2} - x = {x}^{2} + 4x + 20$

${x}^{2} - {x}^{2} = 4x + x + 20$

$0 = 5x + 20$

$x = - \frac{20}{5} = - 4$

Comprobación

$- 4( - 4 - 1) = { - 4}^{2} + 4( - 4) + 20$

$- 4( - 5)= 16 - 16 + 20$

$20 = 20$

Espero que te sirva!!Saludos!!