Question

Solve the equation x2-81 = 0.

Answer 1

2x-81=0

2x=0+81

2x=81

x=81

2

x=40.5 ANSWER.

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Answer 2

40.5

Explanation:

x2 - 81 = 0 --> + 81 to both sides

2x = 81 --> divide by 2 on both sides

x = 40.5