Factorise
$4 x^{2}+9 y^{2}+49 z^{2}-12 x y+42 y z-28 z x$
$(2 x-3 y-7 z)(2 x-3 y-7 z)$
Factorise :
$84-2 r-2 r^{2}$
Write the coefficients of $x^{2}$ in each of the following polynomials
$4+7 x+3 x^{2}$
The zero of polynomial $p(x)=b x+m$ is $\ldots \ldots \ldots$
The polynomial $p(x)=x^{4}-2 x^{3}+3 x^{2}-a x+3 a-7$ when divided by $x+1$ leaves the remainder $19 .$ Find the values of $a .$ Also find the remainder when $p(x)$ is divided by $x+2.$
…… is one of the factors of $p(x)=x^{3}-3 x^{2}+7 x-5$
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