exam Maths Puzzle Numerical Ability

(x+2)(x+4)

I worked this and want to mak sure my answer is correct

I have x^2 +8. Is this correct or x^2 + 2x+6?

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exam Other Question

I really need help here. I need this answer like right now,
2) Is (sqrt x)^2=x an identity (true for all nonnegative values of x)? It is due in less than 30 min, please help me Solve
15x^4-31x^2+10=0

The solution of x= ??