exam Maths Puzzle Numerical Ability

which of this is a function
x=y^2-4 and x^2+7=y

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exam Other Question

Use the quadratic formula:

2x^2-5x=3

Can anyone possibly help me understand this and how to write the answer in the correct terms. Thank you so much ! I cannot figure this out. I tried systems of equations, both substitution and elimination, but could not get it to solve. Thanks

If cd=4 and C^2+d^2=10, what is (c+d)^2