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Romashka [77]
3 years ago
9

Simplify the expression. (x^2 - 9)/(x^2 + 2x - 15)

Mathematics
1 answer:
tia_tia [17]3 years ago
4 0

Answer:

We have

\frac{x^2-9}{x^2+2x-15}

\frac{\left(x+3\right)\left(x-3\right)}{x^2+2x-15}

\frac{\left(x+3\right)\left(x-3\right)}{\left(x-3\right)\left(x+5\right)}

\frac{x+3}{x+5}

∴The answer is D

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b) See annex

x  =  0,5 ft

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Step-by-step explanation:  See annex

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d-2) V = (3-2x)* ( 3-2x)* x   ⇒ V = (3-2x)²*x    

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Taking derivatives

V¨(x) = 9 + 12x² - 24x

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x =[ -b ± √b²- 4ac ] / 2a

we get    x₁  =  1,5       and    x₂ =  0,5

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then

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y =    2 ft   and

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V = 2 ft³

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A square of side length s lies in a plane perpendicular to a line L. One vertex of the square lies on L. As this square moves a
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Answer:

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Part (B) The volume be s^2h=\frac{s^2h}{2}+\frac{s^2h}{2}.

Step-by-step explanation:

Consider the provided information.

It is given that the we have a square with side length "s" lies in a plane perpendicular to a line L.

Also One vertex of the square lies on L.

Part (A)

Suppose there is a square piece of a paper which is attached with a wire through one corner. As you blow it up it spins around on the wire.

This square moves a distance h along​ L, and generate a​ corkscrew-like column with square​.

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Hence, the volume be s^2h=\frac{s^2h}{2}+\frac{s^2h}{2}.

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