Question

What value should be added to the expression to create a perfect square?

x^2 + 16x



8

16

64

4

Answer 1

was thinkin 16

Answer 2

wait no 4

Answer 3

two steps only
and no, not 16
no not that either

Answer 4

what is half of 16? that is step one

Answer 5

Half of 16

And square it

Answer 6

8

Answer 7

second step
what is \(8^2\)?

Answer 8

64

Answer 9

done
finished
next ...

Answer 10

Bingo

Answer 11

hold up

Answer 12

holding...

Answer 13

\[2x^2-2x-1=0\] solve via \[x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}\] with \[a=2,b=-2,c=-1\] or cheat

Answer 14

so i right?

Answer 15

yes

Answer 16

c?

Answer 17

\[b^2-4ac\] with \(a=1,b=-3,c=5\) i.e. \[(-3)^2-4\times 1\times 5\]

Answer 18

oh yea, C

Answer 19

what is \(b^2-4ac\) here?

Answer 20

wat

Answer 21

let me know when you get \(36-12=24\)

Answer 22

important part is that it is a positive number
that means there are two real solutions

Answer 23

why the stupid restrictions? just graph it here

Answer 24

http://www.wolframalpha.com/input/?i=-2x^2%2Bx-3

Answer 25

only question is, can you read the graph to answer the question
is the vertex above or below the x axis?

Answer 26

i need a drink, brb

Answer 27

above?

Answer 28

does it look like it is above to you !!??