Question

(a+b):(a-b)=15:1 then a^2-b^2

Answer 1

(a+b):(a-b)=15:1

(a+b)/(a-b)=15/1

a+b=1-------------(1)

a-b=15------------(2)

_____(1)+(2)

2a=16

a=8

putting the a=8 in equation (1)

a+b=1

8+b=1

b=1-8

b=-7

a²-b²=(8)²-(-7)²

a²-b²=64-(-49)

a²-b²=64+49

a²-b²=113