19) Find the acros F(x) = x4 + 8x? -
1 answer:
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Answer: Option b.
Step-by-step explanation:
1. You have the following parent function given in the problem above:
f(x)=x³ (This is the simplest form. We need to translate it 3 units left and 2 units down)
2. If you take the parent function and make y=f(x+3), then you have:
(The function is shifted 3 units left on the x-axis).
3. Then you if you make y=f(x+3)-2, as following, you obtain:
(The function is shifted 2 units down on the y-axis).
4. Therefore, that is how you obtain the final function.
The answer is the graph shown in the option b.
Answer:
1) The vertices are (-5 , 0) and (5 , 0)
The co-vertices are (0 , -2) and (0 , 2)
The foci are (-√21 , 0) and (√21 , 0)
2) The equation of the ellipse ⇒ x²/48 + y²/64 = 1
Step-by-step explanation:
1) ∵ 4x² + 25y² = 100 ⇒ ÷ 100
∴ x²/25 + y²/4 = 1
∵ The standard equation of the ellipse with center (0 , 0) is
x²/a² + y²/b² = 1
∴ a² = 25 ⇒ ∴ a = ±5
∴ The vertices are (-5 , 0) and (5 , 0)
∴ b² = 4 ⇒ ∴ b = ±2
∴ The co-vertices are (0 , -2) and (0 , 2)
∵ c² = a² - b²
∴ c² = 25 - 4 = 21
∴ c = ±√21
∴ The foci are (-√21 , 0) and (√21 , 0)
2) ∵ Its center is (0 , 0)
∵ The vertex of it is (0 , -8)
∴ a² = 64
∵ The focus is (0 , 4)
∴ c² = 16
∵ c² = a² - b²
∴ b² = a² - c² = 64 - 16 = 48
∵ b² = 48
The standard equation of the ellipse with center (0 , 0) is
x²/b² + y²/a² = 1 ⇒ major axis // to y-axis
∴ x²/48 + y²/64 = 1
