SOLUTION: Solve by factoring. M^2- 9=0

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Question 333281: Solve by factoring.
M^2- 9=0
Answer by mananth(16946) About Me  (Show Source):
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M^2- 9=0
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M^2+3M-3M-9=0
M(M+3)-3(M+3)=0
(M+3)(M-3)=0
M= +/- 3
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