60 divided by 5 is 12 so it would take him 12 minutes to complete the line
1. 2x³ - 11x² + 13x - 21 ÷ x - 3
x - 3 = 0 ⇒ x = 3
3 | 2 -11 13 -21
<u>| ↓ 6 -15 -6</u>
2 -5 -2 -27
1. Answer: 2x² - 5x - 2 - ![\frac{27}{x - 3}](https://tex.z-dn.net/?f=%5Cfrac%7B27%7D%7Bx%20-%203%7D)
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2. 3x³ + 7x² - 13x + 10 ÷ x + 2
x + 2 = 0 ⇒ x = -2
-2 | 3 7 -13 10
<u>| ↓ -6 -2 30</u>
3 1 -15 40
2. Answer: 3x² + x - 15 + ![\frac{40}{x + 2}](https://tex.z-dn.net/?f=%5Cfrac%7B40%7D%7Bx%20%2B%202%7D)
3. 2x³ + 13x² - 21x + 9 ÷ x - 1
x - 1 = 0 ⇒ x = 1
1 | 2 13 -21 9
<u>| ↓ 2 15 -6</u>
2 15 -6 3
3. Answer: 2x² + 15x - 6 + ![\frac{3}{x - 1}](https://tex.z-dn.net/?f=%5Cfrac%7B3%7D%7Bx%20-%201%7D)
4. 7x³ + 0x² - 8x + 16 ÷ x - 2
x - 2 = 0 ⇒ x = 2
2 | 7 0 -8 16
<u>| ↓ 14 28 40</u>
7 14 20 56
4. Answer: 7x² + 14x + 20 + ![\frac{56}{x - 2}](https://tex.z-dn.net/?f=%5Cfrac%7B56%7D%7Bx%20-%202%7D)
5. 8x⁴ - 14x³ - 71x² - 10x + 24 ÷ x - 4
x - 4 = 0 ⇒ x = 4
4 | 8 -14 -71 -10 24
<u>| ↓ 32 72 4 -24 </u>
8 18 1 -6 0
5. Answer: 8x³ + 18x² + x - 6
It's scalene because all three sides are different