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vodka [1.7K]
1 year ago
10

I believe you need to use the quadratic formula for this one, but I am not sure!

Mathematics
1 answer:
Nataly [62]1 year ago
6 0
4x^2+13=49

To solve the value of x in the above equation, here are the steps.

1. Subtract 13 on both sides of the equation.

\begin{gathered} 4x^2+13-13=49-13 \\ 4x^2=36 \end{gathered}

2. Divide both sides of the equation by 4.

\begin{gathered} \frac{4x^2}{4}=\frac{36}{4} \\ x^2=9 \end{gathered}

3. Get the square root on both sides of the equation.

\begin{gathered} \sqrt[]{x^2}=\sqrt[]{9} \\ x=\pm3 \end{gathered}

The possible values of x are +3 and -3. The smaller value is -3.

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The price of a DVD, including 5% sales tax is $21.15. What us the price of the DVD, before sales tax?​
AfilCa [17]

Answer:

20.14

Step-by-step explanation:

21.15 - 5%(1.01) = 20.14

6 0
3 years ago
If my diameter is 35.64 what is my circumference
alexgriva [62]

Answer:

55.9548

Step-by-step explanation:

35.64 ÷ 2 = 17.82

17.82 × 3.14 = 55.9548

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Prove this <br> ASAP PLSSS
lbvjy [14]

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its now proved

Step-by-step explanation:

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2/7x = 10 show work plz
Rashid [163]

Answer:

x = 35

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                    2/7*x-(10)=0

                 2

Simplify   —

                  7

  2        

 (— • x) -  10  = 0

  7        

Subtracting a whole from a fraction

Rewrite the whole as a fraction using  7  as the denominator :

             10             10 • 7

   10 =  ——  =  ——————

               1                 7  

Adding up the two equivalent fractions

Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

           2x - (10 • 7)                       2x - 70

—————————————  =  ———————

                     7                                   7  

Pull out like factors :

  2x - 70  =   2 • (x - 35)

         2 • (x - 35)

 ————————————  = 0

                 7      

When a fraction equals zero ...

Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.

Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.

Here's how:

      2•(x-35)

 ———————— • 7 = 0 • 7

          7    

Now, on the left hand side, the  7  cancels out the denominator, while, on the right hand side, zero times anything is still zero.

The equation now takes the shape :

  2  •  (x-35)  = 0

Solve :    2   =  0

This equation has no solution.

A a non-zero constant never equals zero.

Solve  :    x-35 = 0

Add  35  to both sides of the equation :

                     x = 35

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jek_recluse [69]

Answer:

true..?

Step-by-step explanation:

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