samuel16
samuel16
12-10-2014
Mathematics
Answered
a^2=-42+13a
solve by factoring ?
Answer :
konrad509
konrad509
12-10-2014
[tex]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[/tex]
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