Question

who is good with completing squares

Answer 1

I can help

Answer 2

really

Answer 3

really

Answer 4

thanks so i have this equation x^2+4x=7

Answer 5

Trick to completing a square is taking half of the middle term(one with the x) and squaring it

Answer 6

so 16 or divide by 2 then square?

Answer 7

So our middle term is 4; half is 2; square that and we get 4

Answer 8

yes 4 then from there?

Answer 9

If you add a number of one side of the equation, You MUST also add the same number to other side

Answer 10

x^2+4x+4=7+4

Answer 11

x^2+4x+4=11?

Answer 12

Yes

Answer 13

that would be my answer?

Answer 14

Now we can write x^2+4x+4 as
(x+2)^2

So our equation would be
(x+2)^2=11

Answer 15

okay so if its x^2-4x=1 it would be x^2-4x-4=1-4?

Answer 16

no,
take -4,and half it-- you should get -2 --> Square that, what would you get?

Answer 17

ahhhhhhhhhh..

Answer 18

-2^2 =4

Answer 19

Yes positive 4, not negative

Answer 20

okay so new equation x^2-4x+4=1+4

Answer 21

Yes

Answer 22

yay!!!!

Answer 23

http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4e1486e90b8b62a9006e2ef1

Answer 24

you can factor
x^2-4x+4 into
(x-2)^2

Answer 25

sooo what about the 5 (1+4)...

im a little slow on math.

Answer 26

yes that's on other side of equation
(x-2)^2=5

Answer 27

so the question asks what number mus i add to complete the square it would be positive 4 correct?

Answer 28

no?

Answer 29

Yes

Answer 30

thank you!

Answer 31

You're welcome