Factorise
$x^{2}+4 y^{2}+25 z^{2}+4 x y-20 y z-10 z x$
$(x+2 y-5 z)(x+2 y-5 z)$
Evaluate the following products without multiplying directly
$88 \times 86$
Verify whether the following are True or False:
$\frac{-4}{5}$ is a zero of $4-5 y$
Find the quotient and the remainder when $2 x^{2}-7 x-15$ is divided by
$2 x-3$
Classify the following as linear, quadratic or cubic polynomial
$4 x^{2}-49$
Examine whether $2 x+3$ is a factor of $2 x^{3}+21 x^{2}+67 x+60$ or not.
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