Quadratic equation ex4.3 question no 6
A motor boat speed is 20 km/h in still water. It takes 1 hour more to go upstream than downstream to the same spot. Find the speed of the stream.
The sum of numerator and denominator of a fraction is three less than twice denominator. If each numerator and denominator is decreased by 1, the fraction becomes 1/2 . Find the fraction
The perpendicular AD on the base BC of Δ ABC intersects BC in D such that BD=3CD. Prove that 2AB2=2AC2+BC2.