Question

X²-(x+1)²=2-x² formula general (con procedimiento)

Answer 1

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