Question

Solve
a2=81

a=81

a=_____ because

__ __ =81 and (- )(- )=81

Answer 1

Answer:

a = ± 9

Step-by-step explanation:

a² = 81 ( take square root of both sides )

a = ± $\sqrt{81}$ = ± 9

a = - 9 or a = + 9

Since 9 × 9 = 81 and - 9 × - 9 = 81