book Maths Puzzle Numerical Ability

I have a right triangle I have to find the area for

On the figure they have points a b c
A to C 6ft C to B is 9ft and I must need A-B
the right triangle does show a 90 degree at point C

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book Other Question

Addition seems simple enough to me, but the minus/negative numbers confuse me on factoring.

x2 - 6x - 3 = 0 Can you please help me solve this problem the directions say **Multiply, then simplify each expression. Expression:(y-2)(3y^+2y-2)
So far i have 3y^+2y^-6y^-4