exam Maths Puzzle Numerical Ability

Please help with fraction equation. 5/3u=2/9

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exam Other Question

I need help with this homework problem: find all real zeros of the function
a)f(x)=-9x^4+729x
b)f(x)=x^3-11x^2+26x-16 Is this correct?

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

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