Factorise

$16 x^{2}-40 x y+25 y^{2}$

Classify the following as a constant, linear,quadratic and cubic polynomials:

$5 t-\sqrt{7}$

 …… is one of the factors of $p(x)=x^{3}-3 x^{2}+7 x-5$

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

$x^{2}-15 x+50$

Find the quotient and the remainder when $2 x^{2}-7 x-15$ is divided by

$2 x+1$