Factorise the following quadratic polynomials by splitting the middle term
$12 x^{2}+23 x+5$
$(4 x+1)(3 x+5)$
If $x+y=-4,$ then what is the value of $x^{3}+y^{3}-12 x y+64 ?$
State whether each of the following statements is true or false
$x^{2}-8 x+12=(x-6)(x-2)$
$6 x^{2}+7 x-20$
Classify the following polynomials as polynomials in one variable, two variables etc.
$y^{3}-5 y$
Expand
$(a-2 b+7 c)^{2}$
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