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3241004551 [841]
3 years ago
11

For what value of x does 25x=5x2-3?

Mathematics
2 answers:
Leokris [45]3 years ago
3 0
I might be wrong but I'll give it a shot, you subtract the 5x from the right side and put it on the left with makes it 20x=2-3. Then subtract the 3 from the 2 which makes it 20x=-1. So it would be -0.05.

I'm not 100% sure. But his is my guess.
Savatey [412]3 years ago
3 0
Important:  Use " ^ " to indicate exponentiation:  <span>25x=5x^2-3.

Rearrange these terms in descending powers of x:  5x^2 - 25x - 3 = 0

This is a quadratic equation.  To solve it, you could use a graphing calculator, the quadratic formula, completing the square or other approaches.

</span>Let's complete the square of 5x^2 - 25x - 3 = 0:

5(x^2 - 5x)                        = 3
5(x^2 - 5x + 25/4 - 25/4)   = 3
5(x-5/2)^2    - 125/4          = 3 = 12/4
5(x-5/2)^2                         =137/4
  (x-5/2)^2     -25/4           = 137/20
  (x -5/2)^2                        = 125/20+137/20 = 162/20= 81/10
Taking the sqrt of both sides, we get:

  x-5/2                               = plus or minus 9/sqrt(10)
Then:

x = 5/2 plus or minus 9sqrt(10) / 10, or
x = 25/10 plus or minus 9sqrt(10)/10, or

       25 plus or minus 9sqrt(10)
x = -------------------------------------
                      10
                    
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“the perimeter of the rectangle below is 90 units. find the length of side PS. write your answer without variables.”
Rzqust [24]

Answer:

19

Step-by-step explanation:

The opposite sides are equal, so:

PS = 3y+1

RS = 4y+2

QR = 3y+1

PQ = 4y+2

Therefore, we can set the perimeter 90 = PS+RS+QR+PQ

90 = (3y+1) + (4y+2) + (3y+1) + (4y+2), or,

90 = 2(3y+1) + 2(4y+2)

90 = 6y+2 + 8y+4

90 = 14y + 6

84 = 14y

y = 6

Then, we go back to the question. It's asking for the length of PS. PS = 3y+1, so we plug in 6 for y

3(6)+1

18 + 1 = <u>19</u>

5 0
3 years ago
Which of the following is best described as a three-dimensional solid consisting of a base that can be any polygon a point not i
Harman [31]

Answer:

Option D

Pyramid

Step-by-step explanation:

The clause that gave away the answer is "<em>three-dimensional solid consisting of a base that can be any polygon"</em>

<em></em>

Scanning through the options, we can see that the only option that fits the description is the pyramid.

The pyramid is the only three-dimensional shape amongst the options that can take any polygon as a base.

<em>The other options get screened out here.</em>

A cube must have a square base.

A triangular prism must have a triangular base

A rectangular prism must have a rectangular base

Thus, option D: The Pyramid is the correct answer.

3 0
3 years ago
Help please this question is so hard!
Nitella [24]
So to solve this first you need to convert all the answers to decimals.
Site B 17/9 = 1.89 when you round up
Site D 4/3 = .75
Then look at all the numbers least to greatest.
D .75 m C 1.36 m A 1.60 m B 1.89 m
Answer D, C, A, B
6 0
3 years ago
Express 1.07 into percentage​
Troyanec [42]
1.07 x 100 = 107%
hope this helps! :)
3 0
2 years ago
Read 2 more answers
If F (7) 22, Then F(f-1(22))
jeka57 [31]

Answer:

\boxed{\boxed{f(f^{-1}(22))=22}}

Step-by-step explanation:

\text{If we have}\ f(x)\ \text{and}\ f^{-1}(x),\ \text{then}\\\\\text{if}\ f(a)=b,\ \text{then}\ f^{-1}(b)=a.\\\\\text{Therefore, if}\ f(7)=22,\ \text{then}\ f^{-1}(22)=7.\\\\f(\underbrace{f^{-1}(22)}_{=7})=f(7)=22

6 0
3 years ago
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