using the relationship between the zeroes of the quadratic polynomial.
![\[\begin{aligned} &\text { Sum of zeroes }=\frac{-\left(\text { coefficient of } x^{2}\right)}{\text { coefficient of } x^{3}} \\ &\Rightarrow a-b+a+a+b=\frac{-(-6)}{2} \\ &\Rightarrow 3 a=3 \\ &\Rightarrow a=1 \end{aligned}\]](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-139fef356747c9d5032630eac21891d1_l3.png "Rendered by QuickLaTeX.com")
If 
using the relationship between the zeroes of the quadratic polynomial.
