Given the function f(x)=3x+6, find each value. A. x if f(x)=12 B. f(x) if x=10 C. x if f(x)=6 D. f(x) if x=5

Question

Find the values 

Answer 1

A. F(x)= 3x+6 =12

    3x = 12-6

   3x = 6

  x=2

 

B. x=10, f(x)= 3*10+6 = 30+6 = 36

 

C. f(x) = 3x+6 = 6 

             3x = 6-6

             3x=0

              x=0

 

D. x=5, f(x) = 3x+6 = 3*5+6 = 15+6 = 21

 

When you know x and want to calculate f(x), plug in.

When you know f(x)  and want x, let the value of f(x) equal to the expression of f(x) and solve for x.

 

Hope this helps.