elleblythe
  • elleblythe
Determine all values of k such that the graph of 2kx^2+2kx+k+1=0 intersects the x-axis exactly once. Please show complete solution and answer
Mathematics
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SOLVED
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chestercat
  • chestercat
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.Sam.
  • .Sam.
b2 - 4ac when it is zero you get just ONE real solution so b^2-4ac=0 What is a, b and c?
elleblythe
  • elleblythe
@.Sam. i tried solving for a, b and c and ended up with -4K^2-8k=0 what do i do next?
elleblythe
  • elleblythe
@.Sam. sorry i meant i tried solving for k, not a, b and c

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.Sam.
  • .Sam.
Yeah, just solve for k, add both sides -4k^2, 4k^2=-8k k=-2
elleblythe
  • elleblythe
@.Sam. isn't it supposed to be completing the square? how did you get 2 if there were k's on both sides of the equation?
.Sam.
  • .Sam.
You divide both sides by k

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