Evaluate
$(65)^{2}$
$4225$
$3258$
$4015$
$4369$
Which of the following expressions is a polynomial, state the reason ? If an expression is polynomial, state whether it is a polynomial in one variable or not
$x^{2}+y^{2}+z^{2}+2 x y+2 y z+2 z x$
Degree of the polynomial $4 x^{4}+0 x^{3}+0 x^{5}+5 x+7$ is
$4 x^{2}-20 x+25=(\ldots \ldots \ldots)^{2}$
Expand $:(3 x+7 y)(3 x-7 y)$
Find the value of $a$, if $x-a$ is a factor of $x^{3}-a x^{2}+2 x+a-1$.