Question

$2x.(x - 1) = {x}^{2} - 2x + 9$
ayuda!​

Answer 1

Respuesta:

2x(x - 1) = x^2 - 2x + 9

2x^2 - 2x = x^2 - 2x + 9

2x^2 - 2x - x^2 + 2x - 9 = 0

x^2 - 9 = 0

factoras

(x - 3)(x + 3)

x = 3   x = -3

Comprobación

2x(x - 1) = x^2 - 2x + 9

2(3)(3-1) = (3)^2 - 2(3) + 9

6(2) = 9 - 6 + 9

12 = 12

2(-3)(-3 - 1) = (-3)^2 - 2(-3) + 9

-6(-4) = 9 + 6 + 9

24 = 24

Explicación paso a paso: