exam Maths Puzzle Numerical Ability

Solve by using quadratic formula:
x^2+4x+2=0

This is what I have, not sure if correct?
x=-4+-square root 4^2-4(1)(2) divided by 2

x=-4+-square root 2 divided by 2

x=2 x=-4

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exam Other Question

write an algebraic expression of quantity and let x represent the value.

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Olympic medals- Mark Spitz won two more olympic medals than Carl Lewis did
solve by factoring quadratic equations?

3xsquare + 15=o