Question 1074586: How far will the shot be horizontally from where Andy releases it when it first lands on the field? Explain your answer. The discriminant of the equation is 13, but what does it mean in regards to how fare the shot was? Equation is y= -x^2/10+9x/10+11/5.
Answer by ikleyn(52779)   (Show Source):
You can put this solution on YOUR website! .
To answer the question, you need to solve the equation
y = 0, i.e.
 +  +  = 0.
As the first step, multiply both sides by 10 to rid of the denominators. You will get
 = 0, or
 = 0.
Facto the quadratic polynomial
(x-11)*(x+2) = 0.
The only positive root is x = 11.
Answer. How far the shot was ? 11 feet.
Plot y = + +
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If you want to learn more on solving quadratic equations, read the lessons
- Introduction into Quadratic Equations
- PROOF of quadratic formula by completing the square
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".
When you read these lessons, you will know how the discriminant of the quadratic equation relates to its solution.
By the way, the discriminant of the given equation is 169, not 13.
And this clearly shows that you DON't KNOW what the discriminant of a quadratic equation is.
Do not forget to send your triple "thanks" to me for these things:
- for pointing your error in your previous post
https://www.algebra.com/algebra/homework/quadratic/Quadratic_Equations.faq.question.1074494.html and'
- for solving your problem in this post;
- for teaching you on how to solve quadratic equations.
And remember: your level in these issues is so LOW that does not allow you to dispute/argue with me.
So, saying "thanks" (triple "thanks") is the best thing you can do.
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