Evaluate the following products without multiplying directly

$78 \times 84$

Find the zeroes of the polynomial in each of the following:

$g(x)=3-6 x$

..........is one of the zeros of the polynomial $x^{3}-3 x^{2}-5 x+15$

Expand the following:

$(4 a-b+2 c)^{2}$

Write whether the statement are True or False. Justify your answer.

A binomial may have degree $5$

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

$3 x^{2}+5 x-7+\frac{8}{x}$