Question

i think the answer is 121? not sure how to answer this will post screenshot

Answer 1

121? hehe that seems way too large :D

Answer 2

So like..

Answer 3

\[\large\rm y=x^2+bx\]To complete the square, Toby adds 121 to each side,\[\large\rm y+121=x^2+bx+121\]

Answer 4

121 is a perfect square, do you know which one? :)
Hint 12*12 = 144
9*9 = 81

it's somewhere between there, ya?

Answer 5

9?

Answer 6

so thats the coefficent?

Answer 7

oh you mean for 121!!

Answer 8

9*9=81, not 121 0_o

Answer 9

wait so 9 or11?

Answer 10

We're not to the answer yet...
I'm just asking if you can tell me the square root of 121.

Answer 11

oh okay that is 11

Answer 12

Ok good :)
Let's rewrite the 121 as 11*11 then.\[\large\rm y+121=x^2+bx+11\cdot11\]
When completing the square, we have this squared number on the end,
and we have TWO of these x's in the middle.
So the completed square should look like this:\[\large\rm x^2+11x+11x+11\cdot11\]

Answer 13

So what is the coefficient on your x term? :)
Combine like-terms first!!

Answer 14

Or if this easier for you,
square root the 121,
then double that number.

That's how you find the middle coefficient ^^

Answer 15

x^2+22x+121

Answer 16

okay so then the coefficent is 22 then

Answer 17

Yes :) Good job!

Answer 18

cool thanks