Question

Q 10: If a+b=15 and a 2-b2=60, what is the value of a-b.​

Answer 1

Step-by-step explanation:

If ab=15. a-b=2

We can write a=b+2

Now substitute a value in ab=15

(b+2)b=15

b(sqr)+2b-15=0

b(sqr)+5b-3b-15=0

b(b+5)-3(b+5)=0

(b+5)(b-3)=0

b=-5,3

If b=-5, a=b+2

a=-5+2

a=-3

If b=3,a=b+2

a=3+2

a=5