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BlackZzzverrR [31]
4 years ago
6

Select the correct answer. Simplify the expression (4x - 3)(x + 5).

Mathematics
2 answers:
dolphi86 [110]4 years ago
5 0
To make it simple my guy. x=-15
Zanzabum4 years ago
4 0

Use FOIL to multiply binomials by multiplying each term in the first binomial by the terms in the second binomial.

(4x - 3)(x + 5)

4x^2+20x-3x-15

Now combine like terms.

answer : 4x^2+17x-15

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Jack's brother is 14 years older than him. In six years time, Jack's brother will be twice as old as him. How old is Jack now?
mr Goodwill [35]
14+14 is 28 28-6 is 22 so Jack is 22
3 0
3 years ago
F(x) = ( - 3x² + 2 – 2)e". Find f'(x) and f''(x).<br> f'(2) =<br> f''(c)<br> =
prisoha [69]

Answer:

-3x²-5xeˣ-eˣ

-3eˣx²-11eˣx-6eˣ

Step-by-step explanation:

I'm going to go by the picture and not what you wrote in your title.

To find the derivative of this we have to apply the product rule

(a*b)'=

a'*b+a*b'

We plug in our numbers and get

(-3x²+x-2)'*eˣ+(-3x²+x-2)*eˣ'

Now we can evaluate the derivatives and simplify

(-3x²+x-2)'= -6x+1

eˣ'=eˣ

which means we have

(-6x+1)*eˣ+(-3x²+x-2)*eˣ

Simplify

-6xeˣ+eˣ-3x²eˣ+xeˣ-2eˣ

Combine like terms

-3x²eˣ-5xeˣ-eˣ

Now we just need to find the derivative of this

We can apply the same product rule as we did before

(-3x²eˣ)'

Let's start by factoring out the -3 to get

-3(x²eˣ)'

which is equal to

-3(x²eˣ'+x²'eˣ)

Compute this and get

-3(x²eˣ+2xeˣ)= -3x²eˣ-6xeˣ

Now let's find the derivative of the second part

(-5xeˣ)'

-5(x'eˣ+xeˣ')

-5(eˣ+xeˣ)

-5eˣ-5xeˣ

Which means we have

(-3x²eˣ-6xeˣ)+(-5eˣ-5xeˣ)-eˣ

Combine like terms and get

-3eˣx²-11eˣx-6eˣ

3 0
4 years ago
The dot product of u with itself is 24. what is the magnitude of u?
Leni [432]

Answer - u = 4.8989

u ^ 2 = 24

u = sqrt (24)

u = 4.8989

3 0
3 years ago
Read 2 more answers
You volunteer to help drive children at a charity event to the zoo, but you can fit only 7 of the 18 children present in your va
yulyashka [42]

The answer is 19,448 different groups, using the formula from permutation and combinations C (n, r) = (n!) / (r! (n-r)!) which calculates the number of times where r objects can be chosen from n object.

So,

C (17,7) = (17!) / (7! *(17-7)!)

C (17,7) = (17!) / (7! *10!)

C (17,7) = (17*16*15*14*13*12*11*10!) / (7! *10!) then eliminate 10!

C (17,7) = (17*16*15*14*13*12*11) / (7*6*5*4*3*2*1) = (98017920)(5040)

C (17,7) = 19,448 different groups

3 0
4 years ago
Won has a container with the shape below.
blagie [28]

Answer:

B. The shape can be broken into a rectangular prism and a rectangular pyramid.

C. The formula for the volume of this figure is V = B h + one-third B h.

D. The volume of the container is 2,760 centimeters cubed.

Step-by-step explanation:

I did the edge test.

3 0
3 years ago
Read 2 more answers
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