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(x + 2)² + x² = 130 Para el parentesis aplico productos notables
(a + b)² = a² + 2ab + b²
x² + 2(x)(2) + 4 + x² = 130
x² + 4x + 4 + x² = 130
2x² + 4x + 4 - 130 = 0
2x² + 4x - 126 = 0 Simplificas sacas mitad
x² + 2x - 63 = 0 Factorizas trinomio de la forma x² + bx + c
(x + 9)(x - 7) = 0 Tiene 2 soluciones reales
x + 9 = 0
x = - 9
o
x - 7 = 0
x = 7
Solucion.
(7 , - 9)