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amm1812
2 years ago
10

Given f(x) = 2 / x-3 , find f(4)

Mathematics
1 answer:
Montano1993 [528]2 years ago
4 0

Option #1:

f(x)=\frac{2}{x-3}

f(4), this means that x = 4

To find f(4), substitute/plug in 4 into "x" in the function:

f(x)=\frac{2}{x-3}      Plug in 4 into "x" since x = 4

f(4)=\frac{2}{4-3}

f(4)=\frac{2}{1}

f(4) = 2

Option #2:

f(x)=\frac{2}{x} -3

f(4), this means that x = 4

To find f(4), substitute/plug in 4 into "x" in the function:

f(x)=\frac{2}{x} -3

f(4)=\frac{2}{4} -3    To combine fractions, they need to have the same denominator. Multiply -3 by (\frac{4}{4} ) so that they have the same denominator.

f(4)=\frac{2}{4} -3(\frac{4}{4} )

f(4)=\frac{2}{4} -\frac{12}{4}      Combine the fractions

f(4)=\frac{-10}{4}      Simplify the fraction

f(4)=-\frac{5}{2}

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