Expand
$(x+2 t)(x-5 t)$
$=(x)^{2}+(2 t-5 t) x+(2 t)(-5 t)$
$=x^{2}-3 x t-10 t^{2}$
Factorise
$x^{3}+8 x^{2}+9 x-18$
Factorise the following quadratic polynomials by splitting the middle term
$12 x^{2}+23 x+5$
$x^{2}+2 x-143$
$x^{2}-4 x-77$
Classify the following polynomials as polynomials in one variable, two variables etc.
$y^{3}-5 y$
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