y=3(2+x)
y= 6+3x
Switch x and y
x = 6+3y
solve for y
x-6 = 3y
3y = x-6
y = (x-6)/3
f^-1(x) = (x-6)/3 is the inverse function.
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3x2 + 48 + 192 = 3x2 + 240 = 3 (x2+ 80)
the inverse of x+3
3x2 + 10x + 3 = (x + 3)(3x + 1).
x3 + 3x2 - 9x + 5 = 0 has roots of -5,1 and 1. CHECK : x3 + 3x2 - 9x + 5 = (x + 5)(x - 1)(x - 1)
-3(x - 3)(x + 1)(x + 1)