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Liono4ka [1.6K]
3 years ago
5

Which of the following equations represents the inverse of y = e2x - 9?

Mathematics
2 answers:
finlep [7]3 years ago
8 0

Answer:

\frac{1}{2}ln(x+9) = y

Step-by-step explanation:

We have given an equation.

y = e^{2x} -9

We have to find the inverse of the equation.

Adding 9 to both sides of above equation, we have

y+9 = e^{2x} +9-9

y+9 = e^{2x}

Taking logarithms to both sides of above equation, we have

ln(y+9) = ln(e^{2x})

ln(y+9) = 2x

Dividing by 2 to both sides of above equation, we have

\frac{1}{2}ln(y+9) = x

Putting x  = f⁻¹(y) in above equation ,we have

\frac{1}{2} ln(y+9) = f^{-1}(y)

Replacing y by x , we have

\frac{1}{2}ln(x+9) = f^{-1}(x)

\frac{1}{2}ln(x+9) = y which is the answer.

Keith_Richards [23]3 years ago
4 0

Answer:

y=\frac{1}{2} \ln(x+9)

Step-by-step explanation:

The given function is

y=e^{2x}-9

Interchange x and y.

x=e^{2y}-9

Solve for y.

x+9=e^{2y}

Take logarithm of both sides to base e.

\ln(x+9)=2y

Divide both sides by 2.

y=\frac{1}{2} \ln(x+9)

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Y=(x-4)(x+20) find vertex
andrew11 [14]
Y = (x-4)(x+20)   ===> 0 = (x-4)(x+20)

that means the roots of that quadratic are x = 4 and x = -20.

now, the vertex will be between these two guys, right in between.

from -20 to 4 there are 24 units, half-way of that is 12 units, so, if we move from -20, 12 units to the right or towards 4, we'll end up at -20 + 12 = -8.

so, the vertex's x-coordinate is -8 then, what's "y" anyway?

y = (x-4)(x+20)         x = -8

y = [(-8) - 4] [(-8) + 20]

y = (-12) ( 12)

y = -144

therefore, the vertex is at (-8 , -144)
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The recipe for beef stew calls for 1/4 teaspoon of pepper for every 3 potatoes. If 9 potatoes are used, how much pepper is neede
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Step-by-step explanation:

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x = 3/4

Answer: 3/4 teaspoons of pepper

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#1

\\ \sf\longmapsto 120n=(n-2)180

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\\ \sf\longmapsto 160n=(n-2)180

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