if f(x) = 2x^3 + 3x^2 - 11x - 6 find f(3) and f(-2) and f(-1/2)
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Answered by
45
Answer:
- 42.
- 12.
- 0.
Step-by-step explanation:
Given :
- f(x) = 2x³ + 3x² - 11x - 6.
To find :
- f(3).
- f(-2).
- f(-1/2).
Solution :
Now, f(3).
⇒ 2(3)³ + 3(3)² - 11(3) - 6
⇒ 2(27) + 3(9) - 11(3) - 6
⇒ 54 + 27 - 33 - 6
⇒ 81 - 39
∴ 42
Now, f(-2).
⇒ 2(-2)³ + 3(-2)² - 11(-2) - 6
⇒ -16 + 12 + 22 - 6
⇒ 34 - 22
∴ 12
Now, f(-1/2).
⇒ 2(-1/2)³ + 3(-1/2)² - 11(-1/2) - 6
⇒ 2(-1/8) + 3(-1/2)² - 11(-1/2) - 6
⇒ -21/8 + 3/2 + 11/2 - 6
⇒ -1/4 + 3/2 + 11/2 - 6
⇒ (-1 + 3 + 22)/4 - 6
⇒ 24/4 - 6
⇒ 6 - 6
∴ 0
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