exam Maths Puzzle Numerical Ability

I have been mutiplying bionomials but, this one has three monomials multiplied together, how do I proceed. (2y+1)(y+z)(3y-1)

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Quadratic functions
Find the maximum(or munimun) of each function, also determine the x-intercepts of each function (if any). express your final answers as decimal number (rounded $1,000 at 6% annual interest