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function value

f(x)= 1/x-12  find f(-7)

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Paul O. | Mathematics is Fun - and Easier Than Most People Think!Mathematics is Fun - and Easier Than Mos...
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f(x) means to evaluate the function for a given number x. ("f" is just the name of the function - it could have been named g(x), or z(x) or *(x)... ).

In this case they gave you the number to evaluate this function:  -7.

So simply plug the number they want you to use (-7) and perform the arithmetic.

1/(-7) - 12

Use PEMDAS (parenthesis, exponents, multiplication, division, addition, subtraction) in this order to solve it.

 

Kelsey H. | Versatile and experienced tutor, available in most sciences and mathVersatile and experienced tutor, availab...
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Essentially, when a question such as this asks you to find f(any number here) you are replacing x in the equation with the number within the parenthesis. So in this case, f(-7) = (1/-7)-12. You simply place the number value into the x position and solve.