exam Maths Puzzle Numerical Ability

Please help, I am not sure if what I got for this solution correct. I got a=3 b=0 c=5. It asks to: express irrational solutions in simplest form. If it has no solution, write no solution.
3n^2-75=0
Please help me, Thank You=)

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exam Other Question

the soloution of the system of equations below

y=5-3x
4x-5y=13

how do i solve for x and y
Hi. Can I have some help finding the domain of this function?

g(x)=√x/2x^2+x-1