anonymous
  • anonymous
complete the square ? x2 + 8x = 11
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
What would you add to both sides?
anonymous
  • anonymous
idk , 8
anonymous
  • anonymous
You take half of the x term so half of 8 = 4 Then you square that answer 4^2 = 16

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anonymous
  • anonymous
do you know what the x term refers to?
anonymous
  • anonymous
no how many times do i have to say math is thee worse subject i dont know how to do this
anonymous
  • anonymous
the x term refers to the number in front of the x
anonymous
  • anonymous
you are asked to make the given equation into a square.
anonymous
  • anonymous
x^2+8x-11 = 0
anonymous
  • anonymous
do you know what the formula for (a+b)^2 is?
anonymous
  • anonymous
in other words, \[(a+b)^{2} = ?\]
anonymous
  • anonymous
no
anonymous
  • anonymous
okay, \[(a+b)^{2} = a ^{2}+ 2ab +b ^{2}\]
anonymous
  • anonymous
so the example that i just put up how would that work
anonymous
  • anonymous
compare \[x ^{2}+8x - 11.\] and \[a ^{2}+2ab+b ^{2}\]
anonymous
  • anonymous
x is a. 2ab is 8x
anonymous
  • anonymous
so what must you add to -11 to make it into b^2?
anonymous
  • anonymous
2ab
anonymous
  • anonymous
okay try again. when you compare the two equations, you see that x = a. correct? and 2ab = 8x. so find the value of b.
anonymous
  • anonymous
which grade are you in?
anonymous
  • anonymous
idk , im srry im not Tht qood in math
anonymous
  • anonymous
okay, 2ab = 8x, divide by 2a on both sides. => b = 8x/2a you know that x = a so what is the value of b?
anonymous
  • anonymous
16 , i did 8*2 16
anonymous
  • anonymous
i mean 4 ,
anonymous
  • anonymous
okay good.
anonymous
  • anonymous
thats riqqht
anonymous
  • anonymous
so for (a+b)^2 to be equal to (x+4)^2, what must you add to x^2 +8x-11?
anonymous
  • anonymous
expand (x+4)^2.
anonymous
  • anonymous
maybe 2 0r 4 because i did 8\[\div\]2 qive me 4 then i square root that and qave me 2.
anonymous
  • anonymous
what? you found out that x = a and 4 = b. so your complete square is (x+4)^2. so expand (x+4)^2 using the formula i gave earlier.
anonymous
  • anonymous
okay \[(x+4)^{2}= x ^{2}+8x+16\]
anonymous
  • anonymous
im in the 12th .
anonymous
  • anonymous
you are in 12th grade and don't know what (a+b)^2 is ?That is very surprising. Anyway, compare the expanded version of (x+4)^2 i gave you with your original formula, x2+8x-11
anonymous
  • anonymous
how much do you need to add to x2+8x-11 to get x2+8x+16?
anonymous
  • anonymous
itss not because to mee math is hard for one and for two yu dont have to help mee someone else can if its like that im on here for help not for someone to tell im in the 12th i dont know what something is i guess maybe it dont get through to mee to many smart retricepeople wrong thing for me to come to flutter .
anonymous
  • anonymous
im dont off this question anyway .
anonymous
  • anonymous
make some sense. I did not want to offend you. I was just surprised. I thought basic algebra was taught in 8th grade or something.
anonymous
  • anonymous
you know what flutter you and your negative attititude if yu aint going to help go some where with you ignorgant self and it probably was and wht its 2011 not 2007
anonymous
  • anonymous
okay, have a pleasant day.
anonymous
  • anonymous
you to , feather ! *
anonymous
  • anonymous
Ah, well at least I'm not stupid.

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