Question

(x + 2) (x-2) = (x-1)² ​

Answer 1

Respuesta:

x2 - (x+1)2 = 2 - x2

x2-(x2+2x+1) = 2 - x2

x2 - x2 - 2x - 1 = 2 - x2

x2 - x2 - 2x - 1 - 2 + x2

x2 - 2x - 3

(x -3)(x + 1)

(x-3)=0

x = 3

(x+1)=0

x = -1

-------------------------

x2 - 2x - 3

a = 1

b = -2

c = -3

Fórmula general:

x = - b + - √b2 -4ac / 2a

x = -(-2)+-√(-2)2 - 4(1)(-3) / 2(1)

x = 2 + - √4 + 12 / 2

x = 2 + - √16 / 2

x = 2 + - 4 / 2

Dos soluciones ( + , -)

x = 2 + 4 / 2

x = 6/2

x = 3

x = 2 - 4 / 2

x = -2/2

x = - 1