Factorize:
x2 – 11x – 42
Now, first we have to find out the numbers whose-
Sum = - 11 and
Product = - 42
The numbers are 14 and 3,
So,
= x2 – 14x + 3x – 42
= x(x – 14) + 3(x + 14)
= (x – 14)(x + 3)