Factorise
$25 x^{2}+9 y^{2}+64+30 x y-48 y-80 x$
$(5 x+3 y-8)(5 x+3 y-8)$
Expand
$(2 a+3 b)^{2}$
Find the value of the polynomial $x^{2}-7 x+12$ at.
$x=-2$
Factorise :
$2 x^{3}-3 x^{2}-17 x+30$
Evaluate the following products without multiplying directly
$76 \times 82$
$x=1$
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