anonymous
  • anonymous
Solve. x2 – 4x = 14 a. 2 ± √14 b. 2 ± 2√3 c. 2 ± 3√2 d. 2 ± √10
Mathematics
chestercat
  • chestercat
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Mertsj
  • Mertsj
subtract 14 from both sides and use the quadratic formula or complete the square which might be easier.
anonymous
  • anonymous
ok
anonymous
  • anonymous
now what?

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Mertsj
  • Mertsj
|dw:1326938965160:dw|
anonymous
  • anonymous
wait u dont bring the x with the 4?
Mertsj
  • Mertsj
What do you mean, "bring the x with the 4"?
anonymous
  • anonymous
well why did u add the 4 to the 14?
Mertsj
  • Mertsj
Because I added 4 to the left side to complete the square. Whatever I did to the left, I have to do to the right.
anonymous
  • anonymous
oh, i get it, so its c then?
Mertsj
  • Mertsj
c
Mertsj
  • Mertsj
The 3. It is positive so the parabola opens up. The 5 is the y coordinate of the vertex.

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