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$(i)$ If $z=10$, find the value of $z^3-3(z-10)$
$(ii)$ If $p=-10$, find the value of $p^2-2p-100$
To do: $(i)$ To find the value of $z^3-3(z-10)$ if $z=10$.
$(ii)$ To find the value of $p^2-2p-100$ if $p=-10$.
Solution:
$(i)$. $z^3-3(z-10)$
$=z^3-3z-30$
if $z=10$
$=10^3-3(10)+30$
$=1000 - 30+30$
$=1000$
$(ii)$. $p^2-2p-100$
If $p=-10$
$=(-10)^2-2(-10)-100$
$=100+20-100$
$=20$
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