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Factor the polynomial: c^2 + 20c + 91

Sagot :

Mlcparra16id
We look for two numbers with a product of 91 and a sum of 20,
So we look at the factors of 91,
1 + 91 = 92 X 
7 + 13 = 20 √

So:
c²+20c+91 = (c+7)(c+13)