Determine whether f(x) approaches positive infinity or negative infinity as x approaches 4 from the left and from the right. f(x)=1/(x-4)^2
This function has an even integer exponent (2) so f(x) are all positive. For this reason, when x approaches 4 from left AND from the right, f(x) approaches positive infinity. x=4 is the vertical asymptote.
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