Question

If a and b are roots of the equation 3x²+5x-7=0 then a b are

Answer 1

We will use here product of roots= c/a

then, ab= -7/3

Hence, your answer is -7/3.

Answer 2

If a & b are roots of px²+qx+r= 0 then

a+b= -q/p

ab=r/p

Hence for this problem , p=3 ,q=-5,r=7.

So a+b=5/3 & ab=7/3

Now

a³+b³

= (a+b)³-3ab(a+b)

=(5/3)³-3*7/3*5/3

=-190/27

Hope it will help you