Question

If y=1 is a common root of the equations ay²+ay+3=0 and y²+y+b=0. then ab=3.

Answer 1

putting y=1 in both equations then we find a=-3/2 and b=-2 so ab=(-3)/2×(-2)=3

Answer 2

that question is of quadratic eq. ... and this proof is in that pics