1.

Factorize: x2 – 4x – 12

Answer»

Given, 

x2 – 4x – 12 

Now first find the numbers whose

Sum = - 4 and 

Product = - 12 

Required numbers are 6 and 2, 

So we get; 

x2 – 4x – 12 

= x2 – 6x + 2x – 12 

= x(x – 6) + 2(x – 6) 

= (x – 6)(x + 2)



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