Given f(x) = 2x − 3 and g(x) = f(2x), which table represents g(x)?

Question

x	g(x)
1	2
2	4
3	6

x	g(x)
1	1
2	5
3	9

x	g(x)
1	-1
2	1
3	3

x	g(x)
1	-2
2	2
3	6

Answer 1

Since f(x)=2x-3, then that means f(2x)= 2(2x)-3

We are replacing x with what is in parentheses. This means that g(x) is also 2(2x)-3 or 4x-3.

Since g(x)=4x-3, can you tell which one is the correct table?