To solve the equation \(-x^2 = -36\), we will first isolate \(x^2\) and then solve for \(x\) using inverse operations.
Step 1: Eliminate the negative sign
Multiply both sides of the equation by \(-1\): \[ x^2 = 36 \]
Step 2: Take the square root
To solve for \(x\), we take the square root of both sides. Remember to consider both the positive and negative square roots: \[ x = \pm \sqrt{36} \]
Step 3: Calculate the square root
Since \(\sqrt{36} = 6\), we have: \[ x = 6 \quad \text{or} \quad x = -6 \]
Step 4: Verify the solutions
Now, we will check both potential solutions by substituting them back into the original equation.
Checking \(x = 6\):
\[ -x^2 = -36 \] Substituting \(x = 6\): \[ -(6)^2 = -36 \] Calculating: \[ -36 = -36 \quad \text{(True)} \]
Checking \(x = -6\):
\[ -x^2 = -36 \] Substituting \(x = -6\): \[ -(-6)^2 = -36 \] Calculating: \[ -36 = -36 \quad \text{(True)} \]
Final answer
Both solutions satisfy the original equation. Therefore, the solutions are: \[ \boxed{6 \text{ and } -6} \]