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A^2=-42+13a solve by factoring ?
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A^2=-42+13a

solve by factoring ?

User Andrew Hanlon
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a^2=-42+13a\\ a^2-13a+42=0\\ a^2-6a-7a+42=0\\ a(a-6)-7(a-6)=0\\ (a-7)(a-6)=0\\ a=7 \vee a=6
User Pooshonk
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