A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 3 years ago
Given x2 + 8x  20 = 0. Which expression below would be a correct step if solving by completing the square?
A. (x + 16)2 = 36
B. (x + 4)2 = 20
C. (x + 4)2 = 36
D. (x + 16)2 = 20
anonymous
 3 years ago
Given x2 + 8x  20 = 0. Which expression below would be a correct step if solving by completing the square? A. (x + 16)2 = 36 B. (x + 4)2 = 20 C. (x + 4)2 = 36 D. (x + 16)2 = 20

This Question is Closed

jim_thompson5910
 3 years ago
Best ResponseYou've already chosen the best response.0Work your way backwards So say we want to test if choice D is the answer (x + 16)^2 = 20 x^2 + 32x + 256 = 20 x^2 + 32x + 256  20 = 0 x^2 + 32x + 236 = 0 This is NOT the same as x^2 + 8x  20 = 0, so choice D can't be the answer.

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0its B right? @jim_thompson5910

jim_thompson5910
 3 years ago
Best ResponseYou've already chosen the best response.0(x + 4)^2 = 20 x^2 + 8x + 16 = 20 x^2 + 8x + 16  20 = 0 x^2 + 8x  4 = 0 which is NOT the same as x^2 + 8x  20 = 0

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0ok got it..C thanks!!
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.