If a function has roots -1 and -5, it must be in the form
We can fix the coefficient a by imposing the passing through (0,-30):
So, the function is
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The point-slope form: 
m = -1; (2; 4)
subtitute
y - 2 = -1(x - 4)
m = -1; (2; 4)
subtitute
y - 2 = -1(x - 4)