3 years ago

If f(x) = 3x 7, what is f(-2)?

Mathematics

1 answer:

xxMikexx [17]3 years ago

6 0

-6×7
-42
It's answer is -42

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Jillian has made an error. In which step does it occur?<br> Step 1<br> Step 2<br> Step 3<br> Step 4

Ket [755]

Answer:

What error?

Step-by-step explanation

Can u plz label the steps?

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3 years ago

Find the inverse of the given function.

kodGreya [7K]

For this case we must find the inverse of the following function:

$f (x) = - \frac {1} {2} \sqrt {x + 3}$

We follow the steps below:

Replace f(x) with y:

$y = -\frac {1} {2} \sqrt {x + 3}$

We exchange the variables:

$x = - \frac {1} {2} \sqrt {y + 3}$

We solve for "y":

$- \frac {1} {2} \sqrt {y + 3} = x$

Multiply by -2 on both sides of the equation:

$\sqrt {y + 3} = - 2x$

We raise both sides of the equation to the square to eliminate the radical:

$(\sqrt {y + 3}) ^ 2 = (- 2x) ^ 2\\y + 3 = 4x ^ 2$

We subtract 3 from both sides of the equation:

$y = 4x ^ 2-3$

We change y by f ^ {- 1} (x):

$f ^ {- 1} (x) = 4x ^ 2-3$

Answer: $f ^ {- 1} (x) = 4x ^ 2-3$

7 0

4 years ago

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An item is regularly priced at $33. It is now priced at a discount of 65% off the regular price.

Vinil7 [7]

Step by step explanation:

33 x .65 = 21.45

33 - 21.45 = 11.55

The total of the discounted item is $11.55.

3 0

3 years ago

How can i solve 5.5x+32=57

vladimir1956 [14]

(57-32)➗5.5 =x

The problem is just flipped.

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3 years ago

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What would you multipy and to which equation to start solving by using the elimination method? Then would you add or subtract th

tester [92]

Answer:

multiply the first equation by -2, then add them

Step-by-step explanation:

7x+4y=-4 *-2 7x+4y=-4 *-2 = -14x-8y=8

5x+8y=28

-14x-8y=8 x=-4, y=6

-9x=36

x=-4

7(-4)+4y=-4

-28+4y=-4

4y=24

y=6

8 0

3 years ago