How do you subtract powers?
(i) 72 – 62
(ii) 92 – 82
Thanks
These are not powers. Do you mean
$\displaystyle \text{(i)}\;7^2 - 6^2$ and
$\displaystyle \text{(ii)}\;9^2 - 8^2$?
If so, then just evaluate the powers separately and then subtract:
$\displaystyle \begin{aligned}
7^2 - 6^2 &= 49 -36 \\
&= 13
\end{aligned}$
I'll let you try the other one yourself.
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