Question

What is the value for ƒ(x) = 42x - 100 when x = 2 ?

Answer 1

42(2) -100
84- 100
-16 Is the answer.

Answer 2

So you have 42x-100. We know x = 2, so we can plug it in like this

42(2) - 100

Because 42 and 2 are together like that, we have to multiply the two. The answer will be 84. Then we re-write this like so

84 - 100. Plug that in your calculator or in your head, and you should come up with -16!