Simplify (–9k3 + 12k2 + 9) – (10k3 + 3k2 + 4k – 8)

-19k³ + 9k² + 17

Step-by-step explanation:

Given expression;

         (-9k³ + 12k² + 9)  - (10k³ + 3k² + 4k - 8)

To simplify, expand the brackets.

In the second bracket, the negative sign multiplies through;

   = (-9k³ + 12k² + 9)  - 10k³ - 3k² - 4k + 8

     = -9k³ + 12k² + 9 - 10k³ - 3k² - 4k + 8

     = -9k³ - 10k³  + 12k² - 3k²+ 9+ 8

     = -19k³ + 9k² + 17

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step-by-step explanation:

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