My aim is to compose a tangent equation for the line y=(x-1)*(x+1)*(x+2) provided that tangent points are intersections with x-axis.

Printable View

- February 19th 2006, 03:35 AMtotalnewbieTangent equation
My aim is to compose a tangent equation for the line y=(x-1)*(x+1)*(x+2) provided that tangent points are intersections with x-axis.

- February 19th 2006, 05:46 AMearbothQuote:

Originally Posted by**totalnewbie**

you know already the intersections between x-axis and curve:

(-2,0), (-1,0), (1,0).

Now you need the slope of the tangent lines:

Your function is

The gradient of the function gives the slope of the tangents:

First slope:

2nd slope:

3rd slope:

Now use the point-slope-formula and you'll get:

Greetings

EB