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

Evaluate the discriminant b^2-4ac. Then use the answer to state how many real-number solutions exist for the equation. y=x^2+8x+16 9. the shape of f(x)=x^3, moved 6 units downward, 6 units to the left, and reflected in the y axis. match the equation.

10. the shape of f(x)=sqare root x, moved 9 units downwar