Homework Help: math

Posted by Confused on Friday, December 5, 2008 at 11:32pm.

What is The solution set of 2k^2=21k-49 ?

math - Reiny, Friday, December 5, 2008 at 11:40pm
this an be arranged to the quadratic
2k^2 - 21k + 49 = 0
(2k-7)(k-7) = 0
k = 7/2 or k-7
- math - Confused, Friday, December 5, 2008 at 11:45pm
  Thanks! how do u determine that they are both -7 though? Doesn't it have to equal 21? or doesn't that 21 matter?
  - math - Reiny, Saturday, December 6, 2008 at 12:03am
    why don't you expand (2k-7)(k-7 to see what you get?
math - Brenden, Saturday, December 6, 2008 at 12:06am
oh it makes sense now thanks!
math - Kyle Thompson, Tuesday, December 4, 2012 at 7:42pm
what is Expand:-4(2m - 7x + 9)

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