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Factorize:  a^2 + 6a – 91

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Factorize: 

a2 + 6a – 91

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Best answer

a2 + 6a – 91 

Now, first we have to find out the numbers whose

Sum = 6 and 

Product = - 91 

The numbers are 13 and 7, 

So, 

a2 + 6a – 91 

= a2 + 13a – 7a – 91 

= a(a + 13) – 7(a + 13) 

= (a + 13) (a – 7)

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