exam Maths Puzzle Numerical Ability

The square of a number added to the original number is 72.
Determine all possible values of the number.

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exam Other Question

Mary wants her $9000 GIC to double in value in nine years. What annual rate of interest is required for her to reach her goal. Assume interest is compounded annually. (Can someone What is the value of b if 2x^2 + bx + 8 has a discriminant of -15 ?
i said 7 but my teacher marked it wrong !!! I think I should have said -7 or +7 ,can someone please expain this to me ?