how to solve a square + a - 6
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a^2 + a -6 =0
a^2 + 3a -2a -6 =0
a(a+3) -2(a+3) =0
a = -3 or a =2
a^2 + 3a -2a -6 =0
a(a+3) -2(a+3) =0
a = -3 or a =2
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