exam Maths Puzzle Numerical Ability

Can someone please help?

Solve 3x^2-5x-7=0
Find x intercepts of f(x)=3x^2-5x-7

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the mean of 13 x varies directly as y and inversely as the square of z. If x=10 when y=8 and z=2, find x when y=12 and z=3.