SOLUTION: The function W(x)=-0.02x^2+0.26x+7.5can be used to estimate the number of workers in a certain industry in the United States, in millions, x years after 1990. For what years were t

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Question 1152723: The function W(x)=-0.02x^2+0.26x+7.5can be used to estimate the number of workers in a certain industry in the United States, in millions, x years after 1990. For what years were there (or will there be) 8.3 million workers in this industry?
Answer by ikleyn(52778)   (Show Source): You can put this solution on YOUR website!
.

To answer the question, you need to solve this quadratic equation


     -0.02x^2 + 0.26x + 7.5 = 8.3,


where left side is your given function and the right side is your given value.


Write it in the standard form and solve using the quadratic formula.


Happy calculations (!)

----------------

On solving quadratic equations using the quadratic formula see the lessons
    - Introduction into Quadratic Equations
    - PROOF of quadratic formula by completing the square
in this site.


Also,  you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this textbook under the topic  "Quadratic equations".


Save the link to this online textbook together with its description

Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson

to your archive and use it when it is needed.


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