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Square both sides and checkTechnique

Technique

Square both sides and check

Isolate the radical, square, then test every solution

3 min 3 steps

Squaring both sides works, but it can plant a fake solution. I planted a few fake stories in my time, so now I check every one.

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Calls on

Perfect squares, difference of squaresFactExpand squares in full and factor differences fast

Used by

Solve a nonlinear equationTacticLet the form pick the method, then check every root