Question

X elevado a 2 - 81 sobre 4 =0​

Answer 1

Boa tarde!

X^2 - 81/4 = 0

4x^2/4 - 81/4 = 0

4x^2 - 81 = 0

4x^2 = 81

4x = √81

4x = 9

x = 9/4