Given that is a factor of , find the other two roots of .

Answer and explanation

Correct answer: B.

  1. Step 1: Divide by to get a quadratic: . Step 2. It factorises as , so the roots are and . **Answer: . Why not the others:** : The signs of both roots are reversed. : Both roots are one too large. : One of the roots has the wrong sign.

Practise more Polynomials and the remainder theorem.

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