Factorise the following quadratic polynomials by splitting the middle term
$x^{2}-3 x-40$
$(x+5)(x-8)$
Find the quotient and the remainder when $2 x^{2}-7 x-15$ is divided by
$2 x+3$
$x^{2}+2 x-143$
From the following polynomials find out which of them has $(x+1)$ as a factor
$6 x^{3}+11 x^{2}-5 x-12$
Evaluate
$77 \times 83$
$(421)^{2}$
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