Question

( a + 5 ) ( a - 5 ) + 16 = ( a - 3 )2

Answer 1

2a - 25 + 16 = $a^{2}$ - 9
2a - 9 = $\frac{a}{2}$ - 9
2a - $\frac{a}{2}$ = 18
a= 36 :)