Factorize:
y2 – 6y – 135
Given;
Now first find the numbers whose-
Sum = - 6 and
Product = - 135
Required numbers are 15 and 9,
So we get;
= y2 – 15y + 9y – 135
= y(y – 15) + 9(y – 15)
= (y – 15)(y + 9)