Factorise
$x^{2}+9 y^{2}+4+6 x y+12 y+4 x$
$=(x)^{2}+(3 y)^{2}+(2)^{2}+2(x)(3 y)$ $+2(3 y)(2)+2(2)(x)$
$=(x+3 y+2)^{2}$
$=(x+3 y+2)(x+3 y+2)$
Find the value of the polynomial $x^{2}-7 x+12$ at.
$x=-2$
Prove that $(a+b+c)^{3}-a^{3}-b^{3}-c^{3}=3(a+b)(b+c)(c+a).$
Classify the following as a constant, linear,quadratic and cubic polynomials:
$5 t-\sqrt{7}$
If $x-2$ is a factor of $x^{3}-3 x^{2}+a x+24$ then $a=\ldots \ldots \ldots$
Determine the degree of each of the following polynomials:
$-10$
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