Math Help Forum - View Single Post

Quote:

Originally Posted by yeongil

These are not powers. Do you mean
$\text{(i)}\;7^2 - 6^2$ and
$\text{(ii)}\;9^2 - 8^2$ ?

If so, then just evaluate the powers separately and then subtract
[snip]

Alternatively, use $a^2 - b^2 = (a - b)(a + b)$ .

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