exam Maths Puzzle Numerical Ability

FOIL
(5z-u)(3z+3u)
this is my answer is it correct?
15z^2+12zu-3u^2

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exam Other Question

3x + 6x-9 -6 = 0 for x
over x-1 over x-1

3x over x-1 plus 6x-9 over x-1 minus 6 equals 0 solve for x? Complete the ordered pairs so that each is a solution for the given equation.

3x+4y=12 (0, ), ( ,3/4), ( ,0), (8/3, )