anonymous
  • anonymous
Ok Father and Dauther need help with the following x2 + 8x = 180 by completing the square. Thank in advance
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
i have my teachers lesson in front of me and the homework answer too; which is -18, 11i don't know how they got that
amistre64
  • amistre64
to complete a square we simply have to add a useful add the square of half the x coeff to each side of the equation 8/2 = 4; and 4^2 = 16
anonymous
  • anonymous
the thing to remember for completing the square is (b/2)^2 b over 2 squared you need to add that to each side....awww amistre beat me too it but b is the second term in the trinomial in the form a^2 + b

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amistre64
  • amistre64
x^2 + 8x + 16 = 180 + 16 compact the square (x+4)^2 = 180 + 16 sqrt each side x+4 = +- sqrt(176) subtract the 4 x = -4 +- sqrt(176)
anonymous
  • anonymous
the answer should be 10 or -18
amistre64
  • amistre64
180 + 16 = 196 lol
anonymous
  • anonymous
not 11i
anonymous
  • anonymous
Thank you.
anonymous
  • anonymous
you can check the answer by solving the equation on the calculator ;)
anonymous
  • anonymous
but then how would u solve a similar eqaution tht =0 ?

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