Answer :

To resolve it into factors we first resolve 12

12=1×2×2×3


Given, x2 + (m + n)x + mn=(x + m)(x + n) … (2)


Comparing 1 and 2


m + n =1


mn =-12


(1) can be written as


a2 + 4ab-3ab + 12b2


= (a + 4b)( a-3b)


The resolved factors are (a + 4b)( a-3b).


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