help with tangent line equation?

**johnny4lsu** · October 3rd, 2008, 03:47 PM

I can't seem to be able to figure this one out. Could someone walk me through it?

Find an equation for the line tangent to the graph of

at the point

for

.

=

**skeeter** · October 3rd, 2008, 03:53 PM

show me the derivative ...

**johnny4lsu** · October 3rd, 2008, 03:56 PM

2x(e^x)+(e^x)(2)

**skeeter** · October 3rd, 2008, 04:03 PM

note that it can also be written as $f'(x) = 2e^x(x+1)$

for $f(x) = 2xe^x$ , $f(1) = 2e$

$f'(1) = 4e$

$y - 2e = 4e(x - 1)$

that's all folks.

**johnny4lsu** · October 3rd, 2008, 04:06 PM

thank u so very much skeeter. Ur a life saver!!!!!!!!

Math Help Forum: help with tangent line equation?