Question

If (a + b):(a - b) = 3:2, the (a2 - b2): (a2 + b2) equals:
(a) 5:13
(b) 12:13
(c) 9:4
(d) none of these​

Answer 1

Answer:

if (a+b):(a-b)=3:2 then

2(a+b)=3(a-b)=

2a+2b=3a-3b=

then a=5b.

so, put value of a=5b in this

[a2-b2]:[a2+b2]=

[(5b)2-b2]:[(5b)2+b2]=

(24):(26)=

ans.: option 'b' its 12:13

Answer 2

Answer:

refer to the attachment for the explanation