-x^2 + 4x = 2
do you have to factor out a -1 before you complete the square?
and whats the answer in vertex form?

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asked by tom
  1. I would change the sign by multiplying by -1 and move the 2 to the left side to obtain x^2 -4x +2 = 0 then factor *(it's a perfect square) and solve for x.

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    posted by DrBob222

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