Question

Solve 81 = x ^ 2 for x . Check your solutions

Answer 1

X = ± 9

Explanation:

81 = x² , that is

x² = 81 ( take the square root of both sides )

x = ±
`√(81)` = ± 9

As a check

9² = 9 × 9 = 81 and (- 9) × (- 9) = 81

Answer 2

81 = x²

√81 = x

√9 × 9 = x

9 = x

Verification :-

9 × 9 = 81

9² = 81.

So, the value of x is 9.

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