Question

What's the answer guys...???

Answer 1

for lines, AP=BP
(x-(a-b))²+(y-(a+b))²=(x-(a+b))²+(y-(b-a))²
x²+(a-b)²-2x(a-b)+y²+(a+b)²-2y(a+b)=x²+(a+b)²-2x(a+b)+y²+(b-a)²-2y(b-a)
by solving,
2x(a-b) + 2y(a+b)=2x(a+b)+2y(b-a)
2xa-2xb+2ya+2yb=2xa+2xb+2yb-2ya
4xb=4ya
xb=ya(hence proved)

Answer 2

here's your answer..