exam Maths Puzzle Numerical Ability

Is this correct?

18x^5+15x^4-75x^3z^2

Answer? 3x^3(6x+5z)(x-5z)

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exam Other Question

One the graphed equation y=(x-3)(x-5)(x-a), what is the value of a? Please help me with this problem!
If cos2A = 0 and 0 < or = A < 2pi, find A.

Thank you, Natalie