A community for students.
Here's the question you clicked on:
 0 viewing
kirk.freedman
 2 years ago
Solve the quadratic expression by completing the square.
x2 + 10x – 17 = 7
I did the problem but when I plug my answers into the original equation it doesn't work. this is what i got.
x^2+10x24=0
(x+2)(x12)=0
x=2,12
kirk.freedman
 2 years ago
Solve the quadratic expression by completing the square. x2 + 10x – 17 = 7 I did the problem but when I plug my answers into the original equation it doesn't work. this is what i got. x^2+10x24=0 (x+2)(x12)=0 x=2,12

This Question is Closed

ChristianGeek
 2 years ago
Best ResponseYou've already chosen the best response.0You need to change the signs...(x + 2)(x 12) = x^2  10x 24!

kirk.freedman
 2 years ago
Best ResponseYou've already chosen the best response.1OHH I see, and wait do I have to use some other method to solve this, since it says to solve by completing the square. I have to show my work so I have to make sure I do the problem the way it says or I will get it wrong.

ChristianGeek
 2 years ago
Best ResponseYou've already chosen the best response.0Good point...you do need to use a different method. See this link: http://www.purplemath.com/modules/sqrquad.htm

Hero
 2 years ago
Best ResponseYou've already chosen the best response.1Yes, he should learn how to complete the square because x^2  10x  24 is not even the right polynomial to use.

kirk.freedman
 2 years ago
Best ResponseYou've already chosen the best response.1Can I please get some help on how to do this the right way? I'm confused

kirk.freedman
 2 years ago
Best ResponseYou've already chosen the best response.1I think I probably know how to complete the square, I just need to rejog my memory a bit

Hero
 2 years ago
Best ResponseYou've already chosen the best response.1\[x^2+10x24=0 \\x^2 + 10x = 24 \\x^2 + 10x + 25 = 24 + 25 \\(x + 5)^2 = 49 \\x + 5 = \pm 7 \\x = \pm7  5 \\x = 2 \\x = 12\]

Hero
 2 years ago
Best ResponseYou've already chosen the best response.1The trick is to remember to get whatever you're working with to the form \(ax^2 + bx = c\) Then afterwards, add \(\left(\frac{b}{2}\right)^2\) to both sides.

kirk.freedman
 2 years ago
Best ResponseYou've already chosen the best response.1Thanks so much, I get it:)
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.