Question

f(x) = -2^x
Find the domain and range and explain.

Answer 1

$\\ \sf\longmapsto f(x)+-2^x$

Graph attached

How to find domain and range from co-ordinate pairs?

• If a pair be (x,y)
• Then x=domain and y=range

Now look at the graph

• Co-ordinate is (0,-1)

Here domain can be any real number .

$\\ \sf\longmapsto D_f\in R$

And

Range starts from 0 and infinite in negative y direction.

$\\ \sf\longmapsto R_f\in (\infty,0]$