exam Maths Puzzle Numerical Ability

Simplify

-3i^2 + 4i - 5 times the square root of -9 - 4 + 5i^3

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exam Other Question

The sum of the squares of two consecutive positive integers is 85. Find both integers. Im not how 2 set up the problem haveing trouble divideing polynomicals.
3y^3+y^2/y+1