A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
Solve. 2x2 + 20x = –38
a. –5 ± √14
b. –5 ± √51
c. –5 ± √6
d. –5 ± √13
anonymous
 4 years ago
Solve. 2x2 + 20x = –38 a. –5 ± √14 b. –5 ± √51 c. –5 ± √6 d. –5 ± √13

This Question is Closed

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0c as usual. why is it always c?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0can u show me how, though, im trying hard to remember but its not coming to me...

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0ok first off each term has a factor of 2, so we can make our life easier by writing \[x^2+10x=19\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0then we can write the left hand side as a perfect square , by taking half of 10, which is 5, squaring and adding it to both sides to get \[(x+5)^2=19+25=6\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0then take the square root, don't forget the plus and minus \[x+5=\pm\sqrt{6}\] then subtract 5 \[x=5\pm\sqrt{6}\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0oh i get it now, and this is for all problems like this?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0yes you can always use this method. if you like you could write \[x^2+10x+19=0\] and then use the quadratic formula, but that would be more work because you would have a denominator, and then you would have to simplify the radical, factor and cancel to get the answer you see above

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0oh okay, thanks. can u also help me with http://openstudy.com/study?F295750376716BE3I5S=_#/updates/4f178119e4b0aeb795f57dc2

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0if the coefficient of the "middle term" is even, then it is much easier to complete the square
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.