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Westkost [7]
3 years ago
14

What is the missing expression? x 8 + 3x 5 = x5(_____)

Mathematics
1 answer:
Andrej [43]3 years ago
4 0
We have to factor the polynomial.

x^8+3x^5

Find the GCF between 1,3,x,5,8

The GCF is x^5

Divide the polynomial by x^5

x^5(x^3+3)
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Which statements about the hyperbola are true? Check all that apply. A. There is a focus at (0,−10). B. There is a focus at (0,
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Answer:

A. There is a focus at (0,−10).

Step-by-step explanation:

Assume the hyperbola is like the one below.

The hyperbola is vertical and centred on the y-axis, so its general equation is

\dfrac{y^{2}}{a^{2}} - \dfrac{x^{2}}{b^{2}} = 1

The vertices of your parabola are (0,±8) so a = 8.

The covertices are (±6,0), so b = 6.

Calculate c

\begin{array}{rcl}a^{2} + b^{2} & = & c^{2}\\8^{2} + 6^{2} & = & c^{2}\\64 + 36 & = & c^{2}\\100 & = & c^{2}\\c & = & \mathbf{10}\\\end{array}

A. Foci

The foci are at (0, ±c) = (0, ±10)

TRUE. There is a focus at (0,-10).

B. Foci

The foci are at (0,±10).

False. There is no focus at (0,12)

C. and D. Asymptotes

The equations for the asymptotes are

y = \pm\dfrac{a}{b}x = \pm\dfrac{8}{6}x = \pm\dfrac{4}{3}x

So, y = ±x are not asymptotes.

False.

E. and F. Directrices

The equations of the directrices are  

y = ±a²/c = ±64/10 = ±6.4

y = 6.4 is a directrix.

E is false. x = cannot be a directrix

F is uncertain. Your equation for the directrix is incomplete.

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