Question

what happens to ax^2+bx+c, when b is change to -b?

Answer 1

The factors change therefore the zero's will change and the function will look different.

Answer 2

then b = +(-b)

Answer 3

like i know this much. if a is -a then the parabola goes down. how does -b affect it graph-wise?

Answer 4

b is a generic variable; there is no such thing really as a -b in this case

Answer 5

ohhh, its some sort of shift

Answer 6

http://www.wolframalpha.com/input/?i=y%3Dx%5E2%2B3x+and+y%3Dx%5E2-3x

Answer 7

appears to go symmetric about the y axis

Answer 8

Amistre, you should also apply a C value to get a double root to be more... accurate perhaps?

Answer 9

i can't fix it without making an account :\