Evaluate the following products without multiplying directly
$78 \times 84$
$7546$
$6552$
$4736$
$4865$
$=(80-2)(80+4)$
$=(80)^{2}+(-2+4)(80)+(-2)(4)$
$=6400+160-8=6552$
Factorise
$x^{2}+9 y^{2}+4+6 x y+12 y+4 x$
Factorise :
$84-2 r-2 r^{2}$
Expand
$(2 a+3 b)^{2}$
Find $p(0), p(1), p(-2)$ for the following polynomials:
$p(x)=10 x-4 x^{2}-3$
$9 x^{2}+42 x+49$
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