exam Maths Puzzle Numerical Ability

Verify that P(x) = x^3 - x^2 - ix^2 - 20x + ix + 20i has a zero of i and that its conjugate -i is not a zero. Explain why this does not contradict the Conjugate Pair Theorem.

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Problem:
Insert grouping symbols in the proper place so that the given value of the expression is obtained. The value of the expression should be 28.



5 - 3 x 2 + 8 x 5 -
Please help me with this.



5/6x + 1/3 = 3/4 x -1/2=??