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nyaaawallace nyaaawallace
  • 22-03-2017
  • Mathematics
Answered

x^2 + 18x + c = 25 +c

Verified Answer :

Abu99
Abu99 Abu99
  • 22-03-2017

Rearrange to: x^2 + 18x - 25 = 0
Then factorise (I like to do it by completing the square):
(x + 9)^2 -81 -25 = 0
(x + 9)^2 = 106
x + 9 = sqrt(106)
The sol'ns are:
x = -9 + and - sqrt(106)

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