Algebra - Difference of perfect squares
Difference of perfect squares
Sally has bought tiles to cover the floor of her patio. The tiles can
cover any square area _x_ metres wide by _x_ metres long. She has measured
the patio and found that it is_ x_ + 3 metres long by _x_ - 3 metres wide.
She will have enough tiles, but how many m of tiles will be left over?
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