If $x^{2}-8 x-20=(x+a)(x+b),$ then $a b=\ldots \ldots \ldots$
Which one of the following is a polynomial?
The following expressions are polynomials? Justify your answer:
$\frac{1}{7} a^{3}-\frac{2}{\sqrt{3}} a^{2}+4 a-7$
Verify whether $2$ and $5$ are zeros of the polynomial $x^{2}-2 x-15$ or not.
Determine which of the following polynomials has $x-2$ a factor :
$3 x^{2}+6 x-24$
$4 x^{2}+ x-2$