anonymous
  • anonymous
completeing the square: x^2-10x-5=9
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
You first get the constant numbers to the opposite side of the x^2, so get the -5 to the other side.
anonymous
  • anonymous
x^2 - 10x = 14 do you understand this, so far?
anonymous
  • anonymous
got it!!!!!! thank you so much!

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anonymous
  • anonymous
what did you get for an answer?
anonymous
  • anonymous
x=+- square root of 39?
anonymous
  • anonymous
x=5+_ square root of 39
anonymous
  • anonymous
x^2 - 10x + 25 = 14 + 25 (x - 10)^2 = 39 x - 10 = +-sqrt(39) x = +- sqrt(39) + 10
anonymous
  • anonymous
whered you get the 10 from?
anonymous
  • anonymous
it factors to (x-5)^2
anonymous
  • anonymous
OOPS you are correct....
anonymous
  • anonymous
haha no worries
anonymous
  • anonymous
but then you need to add 5 to both sides... x = +-sqrt(39) + 5 sorry I was texting and doing math at the same time.
anonymous
  • anonymous
blexting can you help with a few more questions?
anonymous
  • anonymous
Sure
anonymous
  • anonymous
M: 2/m + 3/m+9= 11/4
anonymous
  • anonymous
You need to find a common denominator.. is the + 9 in the denominator or all by itself?
anonymous
  • anonymous
m+9
anonymous
  • anonymous
So the denominators are m and m + 9 and 4 so your common denominator is 4m(m+9) do you agree?
anonymous
  • anonymous
yes i agreee!!!
anonymous
  • anonymous
so we multiply everything by that correct?
anonymous
  • anonymous
top and bottom?
anonymous
  • anonymous
8(m+9)+12m =......
anonymous
  • anonymous
Because you have denominators and an equal sign. you need to multiply each term by your common denominator. 4m(m+9)*2/m + 4m(m+9) * 3/(m+9) = 4m(m+9)*11/4
anonymous
  • anonymous
Cancel the denominators into the numerators
anonymous
  • anonymous
4(m+9)*2 + 4m*3 = m(m+9)*11
anonymous
  • anonymous
8(m+9) + 12m = 11m(m+9)
anonymous
  • anonymous
8m + 72 + 12m = 11m^2 + 99m
anonymous
  • anonymous
Because you have an equal sign and an x^2 term you need to put the other side = to 0.
anonymous
  • anonymous
0 = 11m^2 + 79m - 72
anonymous
  • anonymous
I would use the quadratic formula here.. Do you agree with my steps so far?
anonymous
  • anonymous
0 = (11m + 9)(m +8) m = -9/11 or -8 sorry it factors.
anonymous
  • anonymous
im confuseddd ahhhhhhh i got 10.5
anonymous
  • anonymous
i think i got it!
anonymous
  • anonymous
omg got it!
anonymous
  • anonymous
Great...
anonymous
  • anonymous
i <3 you
anonymous
  • anonymous
wanna be our math tutor for the night? i have another problem :D
anonymous
  • anonymous
Sure... for awhile.

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