Polynomials: name them, then add and subtract

Answer Key - Grade 9 Math Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   Kira copies 5x − 4x³ + 2 from the board. Once it is in standard form, what is its leading coefficient?

   -4
2. 2.

   Milo copies 3x² − 8 + 7x⁴ from the board. Once it is in standard form, what is its leading coefficient?

   7
3. 3.

   Ren wants 7 − 3x² + x in standard form. Which of these is it?

   • 7 + x − 3x²
   • 3x² − x + 7
   • −3x² + x + 7
4. 4.

   Tala wants 5x² + 8 − 6x³ in standard form. Which of these is it?

   • 8 + 5x² − 6x³
   • −6x³ + 5x² + 8
   • 6x³ + 5x² − 8
5. 5.

   Zee wants −2x + 6x² − 1 in standard form. Which of these is it?

   • −6x² + 2x − 1
   • −1 − 2x + 6x²
   • 6x² − 2x − 1
6. 6.

   Ari adds (4x² − 3x + 5) + (−x² + 7x − 8). Type x² as x^2. What is the sum in standard form?

   3x^2 + 4x - 3
7. 7.

   Jun adds (x² − 9) + (4x² + 3x + 2). Type x² as x^2. What is the sum in standard form?

   5x^2 + 3x - 7
8. 8.

   Kira works out (5x² + 3x − 2) − (2x² − 4x + 6). Type x² as x^2. What is the difference in standard form?

   3x^2 + 7x - 8
9. 9.

   Milo must subtract (3x² − 2x + 5) from (7x² + x − 1). Type x² as x^2. What is the result in standard form?

   4x^2 + 3x - 6
10. 10.

    Pia must subtract (x² + 4x − 7) from (4x² − 3x + 2). Type x² as x^2. What is the result in standard form?

    3x^2 - 7x + 9