# Math Help - Values on a tangent line.

1. ## Values on a tangent line.

Here's the problem:

"Find the value of c in Figure 3.12 where the line $l$ tangent to the graph of $y=2^x$ at (0,1) intersects the x-axis."

Any help on how to do this, please?

If a picture is needed, just let me know, and I'll try to find one.

2. Originally Posted by Rumor
Here's the problem:

"Find the value of c in Figure 3.12 where the line $l$ tangent to the graph of $y=2^x$ at (0,1) intersects the x-axis."

Any help on how to do this, please?

If a picture is needed, just let me know, and I'll try to find one.
find the equation of the tangent line, set y = 0, and solve for x.

3. Originally Posted by skeeter
find the equation of the tangent line, set y = 0, and solve for x.
Ah, thank you!

I got the correct answer now.