Question

X la puterea a 2 a + 3 la puterea a 4 a =15 la a2a

Answer 1

$x^{2}$+ 81=225
$x^{2}$ = 225-81
$x^{2}$ = 144
x = $\sqrt{144}$
x = 12

Answer 2

x^2+3^4=15^2
x^2+81=225
x^2=144
12^2=144=>x=12
^= la puterea