Question

$5 ^{2x} -2*5-15=0$

Answer 1

$5 ^{2x} -2*5-15=0$
$5 ^{2x} -10-15=0$
$5 ^{2x} -25=0$
$5^{2x}=25$
$5^{2x}=5^2$
$2x=2$
$x=1$