Why is –1 + 1 = 0?

(please, please answer!!)

Answer

so if you got 1 candy bar and your friend took 1 candy bar from you how many candy bars do you have left? 0, you have zero

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb

i belive those are the ones that are under 90 degreese.