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Mathematics, 20.08.2019 04:30 dkhakdoust

Factor by grouping:
4-12r+9r^2
i know the answer is (2-3r)^2
can anyone explain to me how it is?

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Factor by grouping:
4-12r+9r^2
i know the answer is (2-3r)^2
can anyone explain to m...
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