Question

x^2=81 use inspection to solve
{-9,9}
{9}
{-9}
There are no real solutions

Answer 1

To solve the equation \(x^2 = 81\) using inspection, we can look for values of \(x\) that, when squared, equal \(81\).

We know that:
\[
9^2 = 81 \quad \text{and} \quad (-9)^2 = 81
\]

Therefore, the solutions are \(9\) and \(-9\).

Thus, the correct answer is:
\(\{-9, 9\}\)