jejejdiwmeoc jejejdiwmeoc
  • 13-01-2018
  • Mathematics
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What is the value of c

What is the value of c class=

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altavistard
altavistard altavistard
  • 15-01-2018
x^2 + 6x = 13.  We are to "complete the square."

x^2 + 6x + (6/2)^2 - (6/2)^2 = 13

Then (x+3)^2 - 9 = 13, or (x+3)^2 = 22.

then x+3 = plus or minus sqrt(22), or     x = -3 plus or minus sqrt(22).

Given x^2 + 6x = 13, to complete the square we insert " 3^2 - 3^2 " between the "6x" and the "=" sign.
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