book Maths Puzzle Numerical Ability

Can someone please show me how to do this:
(s+3)(s-3)

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book Other Question

The length of a rectangle is 3x+4y feet, and the width is 2x-3y feet. compute the perimeter and the area. Simplify the expression. Assume that all variables
represent nonzero integers.

[x(-3a - 2)]-4</sup></PRE>