simplify (a+10)^2 -4(10a+1)
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(a+10) ²-4(10a+1) =0
→a²+20a+100-40a-4=0
→a²-20a+96=0
→a²-12a-8a+96=0
→a(a-12) -8(a-12) =0
→(a-8) (a-12) =0
→a=8 or a=12
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