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Subtract polynomials

Grade 8

What this lesson shows

Take 5 x squared, plus 3 x, plus 7... and subtract 2 x squared, plus 4 x, plus 1. This is where more marks are lost than anywhere else in the topic — and it is all down to one sign.

Try it yourself

Real questions from this lesson's worksheets — answers below each one.

  1. Simplify (3x + 2) - (x + 1).
    Show answer
    2x + 1
  2. Simplify (4x + 3) - (2x + 1).
    Show answer
    2x + 2
  3. Simplify (3x + 6) - (x + 1).
    Show answer
    2x + 5
  4. Simplify (3x + 5) - (x + 2).
    Show answer
    2x + 3

Practise this every day

Eduyro gives your child a short daily worksheet on exactly this skill, and moves them on only once they have it. Watch the lesson, then build the fluency.

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