Question

complete the square ? x2 + 8x = 11

Answer 1

What would you add to both sides?

Answer 2

idk , 8

Answer 3

You take half of the x term so half of 8 = 4

Then you square that answer 4^2 = 16

Answer 4

do you know what the x term refers to?

Answer 5

no how many times do i have to say math is thee worse subject i dont know how to do this

Answer 6

the x term refers to the number in front of the x

Answer 7

you are asked to make the given equation into a square.

Answer 8

x^2+8x-11 = 0

Answer 9

do you know what the formula for (a+b)^2 is?

Answer 10

in other words,
\[(a+b)^{2} = ?\]

Answer 11

no

Answer 12

okay,
\[(a+b)^{2} = a ^{2}+ 2ab +b ^{2}\]

Answer 13

so the example that i just put up how would that work

Answer 14

compare \[x ^{2}+8x - 11.\]
and
\[a ^{2}+2ab+b ^{2}\]

Answer 15

x is a. 2ab is 8x

Answer 16

so what must you add to -11 to make it into b^2?

Answer 17

2ab

Answer 18

okay try again.
when you compare the two equations, you see that x = a. correct?
and 2ab = 8x.
so find the value of b.

Answer 19

which grade are you in?

Answer 20

idk , im srry im not Tht qood in math

Answer 21

okay,
2ab = 8x, divide by 2a on both sides.
=> b = 8x/2a
you know that x = a
so what is the value of b?

Answer 22

16 , i did 8*2 16

Answer 23

i mean 4 ,

Answer 24

okay good.

Answer 25

thats riqqht

Answer 26

so for (a+b)^2 to be equal to (x+4)^2, what must you add to x^2 +8x-11?

Answer 27

expand (x+4)^2.

Answer 28

maybe 2 0r 4 because i did 8\[\div\]2 qive me 4 then i square root that and qave me 2.

Answer 29

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.

Answer 30

okay \[(x+4)^{2}= x ^{2}+8x+16\]

Answer 31

im in the 12th .

Answer 32

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

Answer 33

how much do you need to add to x2+8x-11 to get x2+8x+16?

Answer 34

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 .

Answer 35

im dont off this question anyway .

Answer 36

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.

Answer 37

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

Answer 38

okay, have a pleasant day.

Answer 39

you to , feather ! *

Answer 40

Ah, well at least I'm not stupid.