Expand
$(2 x-3)(2 x+5)$
$=(2 x)^{2}+(-3+5)(2 x)+(-3)(5)$
$=4 x^{2}+4 x-15$
If $(2 x+3)(3 x-1)=6 x^{2}+k x-3,$ then find $k$.
Write the coefficients of $x^{2}$ in each of the following polynomials
$4+7 x+3 x^{2}$
If $(5 x-3)^{2}=25 x^{2}+k x+9,$ then find $k$
Evaluate
$153 \times 147$
Factorise
$9 x^{2}+42 x+49$
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