Question

(x + 5)(x + 9) = 20​

Answer 1

Respuesta:

Dos soluciones:

x₁ = -7 + 2√6

x₂ = -7 - 2√6

Explicación paso a paso:

(x + 5)(x + 9) = 20​

=> x² + 9x + 5x + 45 = 20

=> x² + 14x = -25

=> x² + 14x + 49 = -25 + 49

=> (x + 7)² = 24

=> x + 7 = ±√24 = ±2√6

=> x = -7 ± 2√6

=>

x₁ = -7 + 2√6

x₂ = -7 - 2√6