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antoniya [11.8K]
2 years ago
12

Multiply (5x−8) (2x+4)

Mathematics
2 answers:
natka813 [3]2 years ago
8 0

Answer:

10x^{2}+4x-32

Step-by-step explanation:

5x times 2x =10x^{2}

5x times 4 = 20x

-8 times 2x = -16x

-8 times 4 =-32

10x^{2} +20x - 16x - 32

20x -16x = 4x

10x^{2} + 4x - 32

irga5000 [103]2 years ago
6 0

Answer:

10x^2 + 4x - 32

<em>I hope this helps :)</em>

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The volleyball team has 41 members. There are 3 more boys than girls how many girls are there?
Pie
19 members are girls
4 0
3 years ago
You throw a ball up and its height h can be tracked using the equation h=2x^2-12x+20.
postnew [5]

<em><u>This problem seems to be wrong because no minimum point was found and no point of landing exists</u></em>

Answer:

1) There is no maximum height

2) The ball will never land

Step-by-step explanation:

<u>Derivatives</u>

Sometimes we need to find the maximum or minimum value of a function in a given interval. The derivative is a very handy tool for this task. We only have to compute the first derivative f' and have it equal to 0. That will give us the critical points.

Then, compute the second derivative f'' and evaluate the critical points in there. The criteria establish that

If f''(a) is positive, then x=a is a minimum

If f''(a) is negative, then x=a is a maximum

1)

The function provided in the question is

h(x)=2x^2-12x+20

Let's find the first derivative

h'(x)=4x-12

solving h'=0:

4x-12=0

x=3

Computing h''

h''(x)=4

It means that no matter the value of x, the second derivative is always positive, so x=3 is a minimum. The function doesn't have a local maximum or the ball will never reach a maximum height

2)

To find when will the ball land, we set h=0

2x^2-12x+20=0

Simplifying by 2

x^2-6x+10=0

Completing squares

x^2-6x+9+10-9=0

Factoring and rearranging

(x-3)^2=-1

There is no real value of x to solve the above equation, so the ball will never land.

This problem seems to be wrong because no minimum point was found and no point of landing exists

3 0
3 years ago
Zane bought a pair of jeans that originally cost $56. He used a coupon for 25% off and paid 8% in sales tax. How much did he pay
sattari [20]

Answer:

$38.64

Step-by-step explanation:

so the equation needed to solve is $56*0.25 and that number is 14. Since it is a coupon you subtract 14 from 56 and end up with 42. Now multiply 0.08*42 and you got your sales tax, $3.36. now subtract that from 42 and you have your answer! Don't forget the dollar sign!

hope this helped! : )

5 0
3 years ago
How do you turn 3/5 to a decimal​
Simora [160]

Answer:  the answer is 0.6

Step-by-step explanation:

you divide 3 by 5

5 0
3 years ago
Please answer. Confusing me. 20 points.
Sedbober [7]
The answer is either x = -1 or x = 4.
7 0
3 years ago
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