The domain are the values of X that can be used and not encounter an error. In this case, no matter what you forgot, either a minus or a plus, makes the answer "all reals"
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The domain of y = -4x is all real numbers.
Since your expression is a linear equation your domain would be all real numbers. This means all of the units on the x-axis.
4x+13 = 21 4x = 21-13 4x = 8 x = 2
ln(4x)=13 4x=e^13 x=(e^13)/4
x2 - 4x - 9 = 0 ∴ x2 - 4x = 9 ∴ x2 - 4x + 4 = 13 ∴ (x - 2)2 = 13 ∴ x - 2 = ±√13 ∴ x = 2 ± √13