algebra · worked example

Solve 3x² - 12 = 0

Method: isolate and square root. Verified step-by-step solution with our free AI math solver.

Problem

$3x^2 - 12 = 0$

Step-by-step solution

Add $12$ to both sides: $3x^2 = 12$ .
Divide both sides by $3$ : $x^2 = 4$ .
Take the positive and negative square roots: $x = \pm 2$ .

Answer

$x = 2 \quad \text{or} \quad x = -2$

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