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apply the quadratic formula to find the roots of the given function, and then graph the function f(x)=y^2-9 please show work for credit

Mathematics
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OM goodness! :/
lol
thats what i said

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Other answers:

ha ah.. Hey, are you sure that's written correctly? :/
usually it's f(x) = x^2 - 9
not y^2 - 9
f(x) = x^2 - 9
ok, soooooo. huh... I guess f(x) = x?? lol
i am having problems figuring out a b c for the formula
weird. then it should be f(y) = y^2 -9 because we are dealing with a function of y
it is changed to x
f(x) = x^2 - 9
AND there is no need to use the quadratic because you can factor this! x^2 - 9 = x^2 - 3^2 = (x+3) (x-3) so x is simply plus or minus 3! use the quadratic? for what! lol
finding the roots
well, the roots are -3 and 3 but anywyay with the quadratic you want to use (1)x^2 + 0x - 9 a = 1 b = 0 c = -9
ok now I think I got it from there

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