Well, honey, F(x) = -3x + 1. That's the function right there. So, if you plug in a value for x, you just gotta multiply it by -3 and then add 1. Simple math, darling.
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I think you mean (3x ± 1)^2 = (3x+1)(3x-1)?
fx=3x-5 f=(3x-5)/x f2=(6x-10)/x /=divide
-3x + 1
(-3x - 1)(3x - 7)
y = 3x + 1