
Let A(r1cosθ,r1sinθ)
A Lies on straight line 4x+3y=10
⇒4(r1cosθ)+3(r1sinθ)=10
⇒r1(4cosθ+3sinθ)=10
⇒r1=4cosθ+3sinθ10
Let B(−r2cosθ,−r2sinθ)
B lies on line 8x+6y+5=0
⇒8(−r2cosθ)+6(−r2sinθ)+5=0
⇒r2(8cosθ+6sinθ)−5=0⇒r2=8cosθ+6sinθ5
∴r2r1=14