Factorise
$4 x^{2}+9 y^{2}+49 z^{2}-12 x y+42 y z-28 z x$
$(2 x-3 y-7 z)(2 x-3 y-7 z)$
Find the zeroes of the polynomial in each of the following:
$g(x)=3-6 x$
Find $p(1), p(2)$ and $p(4)$ for each of the following polynomials
$p(x)=x^{3}+9 x^{2}+23 x+15$
Find the zero of the polynomial in each of the following cases
$q(y)=\pi y+3.14$
Without actually calculating the cubes, find the value of each of the following
$(21)^{3}+(15)^{3}+(-36)^{3}$
Evaluate
$77 \times 83$
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