exam Maths Puzzle Numerical Ability

Can you help me simplify (-7-5i) - (-2+8i) thank you

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exam Other Question

x^3 + 3 divided by x Please help my solve this multiplying matrices.

solve for x and y.
[4 1 3] [9 -2]
[-2 x 1] [2 1] = [y 5]
[-1 4] [-13 11]

each