exam Maths Puzzle Numerical Ability

solve by factoring quadratic equations?

3xsquare + 15=o

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exam Other Question

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 Solve the following system of linear inequalities by graphing
x-2y>4
x<4

Please help on this