exam Maths Puzzle Numerical Ability

please help!

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4 + c/4y^2

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exam Other Question

Please multiply and simplify, if possible. all variables represent positive real numbers.

-2sqrt5x(4sqrt2x-3sqrt3) I am now stuck on the factoring by group.

45x^2 + 39x + 6

I wish math came easier to me! I think I have some of it just not to sure
3(15x^2 + 13x + 2)