Question

( 2 . x + 5 ) ala 2 + 1 = 82

Answer 1

Resolver.

(2x + 5)² + 1 = 82
(2x + 5)² = 82 - 1
(2x + 5)² = 81      Sacas raiz cuadrada a ambos lados de la ecuacion
√(2x + 5)² = √81
2x + 5 = +/- 9       Tiene 2 soluciones reales
2x + 5 = 9
2x = 9 - 5
2x = 4
x = 4/2
x = 2
  o
x + 5 = - 9
2x = - 9 - 5
2x = - 14
x = - 14/2
x = - 7

Solucion.
(2 , - 7)