If $(2 x+3)(3 x-1)=6 x^{2}+k x-3,$ then find $k$.
$7$
$5$
$11$
$17$
Factorise
$x^{3}+12 x^{2}+39 x+28$
Classify the following as a constant, linear quadratic and cubic polynomials:
$2-x^{2}+x^{3}$
$27 x^{3}-y^{3}+64 z^{3}+36 x y z$
Evaluate the following products without multiplying directly
$78 \times 84$
Multiply $x^{2}+4 y^{2}+z^{2}+2 x y+x z-2 y z$ by $(-z+x-2 y)$
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