exam Maths Puzzle Numerical Ability

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

thank you in advance

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exam Other Question

18/48 = 12/n Simplify the expression
3y^2 + 5yz + 2z^2 / 2y^2 + 3yz + z^2