exam Maths Puzzle Numerical Ability

What iz an algebra geo pic??

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Please help me with this problem I am about to pull my hair out.

Suppose that a polynomial function of degree 4 with rational coefficients has -1,0, and 2-3i as zeros. What is the remaining zero? Karl invested part of $8000 in stock that lost 2%.He invested the rest at 8% annually. If his gain for the year was at least 400$, what was the most he could have invested in stoc