Question

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

Answer 1

-43K+17

Explanation:

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

-9.3=-27 10.3=30

12.2=24 3.2=6

=(-27k+24k+9) - (30k+6k+4k-8)

COLLECT LIKE TERMS

=(-3k+9) - (40K-8)

= -3k+9-40k+8

= -43k+17

Answer 2

-19k³ + 9k² + 17

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