exam Maths Puzzle Numerical Ability

Are (x - 1) and (x + 4) factors of P(x) = 2x3 + 5x2 - 13x + 4 ?

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This test is very difficult and any help would be so very much appriciated, please reply asap. The problem is:

Please Simplify
3-5i
2+7i 4 + /r+2/ = 7