The principle "$ab = 0 \Rightarrow a = 0$ or $b = 0$" is used in the method of—

Question

Accepted Answer

factorization

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completing square

Answer

quadratic formula

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graphing

The principle "ab=0⇒a=0ab = 0 \Rightarrow a = 0ab=0⇒a=0 or b=0b = 0b=0" is used in the method of—