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

Please help with fraction equation. 5/3u=2/9 Please help me find the domain and range of f(x), g(x) and h(x)

f(x)=25-7x g(x)=13 h(x)= x^2 +22x

Thanks