exam Maths Puzzle Numerical Ability

Hi May I have some help with finding solutions to this equation?

Find all real solutions of the following equation. (If there are extra answer boxes, enter NONE.)
x^5 + 216x^2 = 0

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exam Other Question

A small firm produces both AM and AM/Fm car radios. The AM radios take 12h to produce, and the AM/FM radios take 20h. The production hours is limited to 300h per week. The plants c Lynn Ogen invested some money at 9% interest and $100 less than that at 7% interest. Her total annual interest was $73. How much did she invest at 7% interest?