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Q20 of 137 Page 102

Factorize:
y² + y – 72

Given,

y² + y – 72

Now, first we have to find out the numbers whose-

Sum = 1 and

Product = - 72

The numbers are 9 and 8,

So,

y² + y – 72

= y² + 9y – 9y – 72

= y(y + 9) – 9(y + 9)

= (y + 9)(y – 9)

More from this chapter

18

Factorize:

y² + 7y – 144

19

Factorize:

z² + 19z – 150

21

Factorize:

a² + 6a – 91

22

Factorize:

p² – 4p – 77