Factorise
$8 x^{3}-26 x^{2}+13 x+5$
$(x-1)(4 x+1)(2 x-5)$
Expand
$(2 x+5 y)^{2}$
Without actually calculating the cubes, find the value of each of the following
$(21)^{3}+(15)^{3}+(-36)^{3}$
Factorise :
$x^{2}+9 x+18$
The following expressions are polynomials? Justify your answer:
$\frac{1}{5 x^{-2}}+5 x+7$
$(6 x-7)^{2}$
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