You get imaginary roots for this equation.
x=4-5i
x=4+5i
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Y =

You can get this by switching the x and f(x) in the equation and then solve for f(x)
f(x) = 19/2x - 21 ---> now switch them
x = 19/2f(x) - 21 ---> now add 21 to both sides
x + 21 = 19/2f(x) ---> now multiply by 2/19 on both sides
(2x + 42)/19 = f(x) ---> ANSWER
Answer:
12
Step-by-step explanation: