Root of Equation

Thanks, I've updated the answer.

Hah! You must be kidding me! This is by far the most easiest sum I have encountered here on Brilliant. Just use the Vieta's formula to find the product of the roots for the quadratic polynomial.

If roots are $\alpha, \beta$ , then,

\Large \alpha + \beta = \frac{-\text{Coefficient of x}}{\text{Coefficient of x^2}}

and, \Large \alpha. \beta = \frac{\text{Constant term}}{\text{Coefficient of x^2}}

ok..thanks a lot

roots of equation are 4,1 so product is 4