given the function f(x)=4x-3 what is the corresponding value when x=-1

Question

need help?????????

 

Answer 1

Hello Janet -

f(x) = 4x - 3; This is saying you have a function f that is in terms of a variable x.  So whatever is in the parenthesis of "f(x)" you replace x with that value.

 

So for your problem you are asked what is f(x) when x = -1. To solve you put in -1 wherever an "x" is.

f(-1) = 4(-1)-3 = -4-3 = -7

 

Until you are comfortable with the math I recommend always putting parenthesis around where you plug in values.

 

Another example. What is f(x) when x = 5

f(5) = 4(5)-3 = 20-3 = 17

 

Hope that is helpful. Best - David