Solve the Equation $2 \log _ { 2 } x = 1 + \log _ { 2 } ( x + 40 )$

Multiple Choice

Solve the equation. $2 \log _ { 2 } x = 1 + \log _ { 2 } ( x + 40 )$

A) $x = 14$
B) $x = 10$
C) none of these
D) $x = 8$
E) $x = - 8$