samuel16 samuel16

12-10-2014
Mathematics

Answered

a^2=-42+13a

solve by factoring ?

Verified Answer :

konrad509 konrad509

12-10-2014

\(a^2=-42+13a\\ a^2-13a+42=0\\ a^2-6a-7a+42=0\\ a(a-6)-7(a-6)=0\\ (a-7)(a-6)=0\\ a=7 \vee a=6\)

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