Homework Help: Algebra

Posted by Charly on Thursday, June 2, 2011 at 9:57am.

I was given this answers to a problems I solved but I do not understand what she means hope you can help.

Before attempting to solve this quadratic equation, determine how many solutions there will be for this quadratic equation. Explain your reasoning. Finally, solve the equation.
(x - 9)2 = 81

I too, came up with the same answer and agree that this is a positive number and we should expect there to be two solutions to this problem. Carrying out the square is exactly the same as using the quadratic formula it is where you substitute a, b and c into the formula. It gives you the same answer to the polynomial used. This is because the quadratic formula came from finishing the square. Completing the square method is like the father of the quadratic formula.

(x - 9)2 = 81
(x - 9) = Бу81
x = 9Б}9
x = 18 or x = 0

This answer was inreponce to another student who came up with the same as i did.

Hi Charly,

Yes, your answer is correct. Nice work. However, the method you used is not completing the square. Which one might it be, do you think?

Algebra - PsyDAG, Thursday, June 2, 2011 at 11:59am
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.

Answer this Question

Related Questions

Algebra problems - I have some problems that I would like checked please. Find ...
Algebra - I was given this answers to a problems I solved but I do not ...
Algebra 1 - Randy, Sam, Tim and Will counted the number of puzzles they had ...
Algebra - Randy, Sam, Tim and Will counted the number of puzzles they had solved...
Math - I'm using the quadratic equation and I understand how to use it, but ...
Algebra - Can someone check my algebra answers and help me with the problems I ...
math problems - thanks alot for giving me those sites but i already know this ...
Algebra II - Solve x^4 - 12x - 5 = 0 given that -1 + 2i is a root. I’ve ...
English - 1. He solved two math questions with ease. 2. He solved two math ...
college algebra--I really need help!! - solve the following exponential equation...

For Further Reading

First Name:
School Subject:
Answer: