Question

Complete the equation for te function picturEd in each mapping diagram. The domain is 1,2,3,4 and the range is 2,4,8,16. The equation is a number times X what's the equation. The book says that the answer is 2x but I don't know how they got that. Please help me anyone!!!!! :(

Answer 1

Because each number for the range is the domain multiplied by 2. Look at each pair of numbers. domain 1, range 2...isn't 1 x 2 = 2? domain 2, range 4..2 x 2 = 4..etc

Answer 2

Yes but 2•3 does not equal 8 it equals 6

Answer 3

the answer is 2^x which does not mean the same thing as 2x.

2^x means 2x2x2...2 x times.
so 22⁴=2x2x2x2=16, etc.

x 1 2 3 4 5...
2x 2 4 6 8 10...

but
x 1 2 3 4 5 ...
2^x 2 4 8 16 32 ...