exam Maths Puzzle Numerical Ability

I cant figure out how to solve the problem X2 + 9x + 3 = 0.
I was told i need to use the quadratic formula though. Any help would be greatly appreciated.

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exam Other Question

The set of positive real numbers is closed under which operation(s)? Select all that apply.

a. Multiplication
b. Division
c. Addition
d. Subtraction
6x-2y=2
9x-3y=1