prasannar wrote:

Is x^2 equal to xy?

(1) x2 – y2 = (x + 5)(y - 5)

(2) x = y

ritula wrote:

(1)x^2-y^2=(x+y)(x-y)=(x + 5)(y - 5)

so y=5 but no information abt x so insufficient

(2) x=y

multiplying both sides by x

x^2=xy sufficient

So answer should be B

FN wrote:

this should be B..

x^2-y^2=(x-y)(x+y)..

we have (x+5)(y-5)... (y-5) is not equal to (x-y)

here x is negative...so insuff

Can someone please explain this DS problem in more detail? Bunuel ??... Please can you help! TY