### Home > CALC > Chapter 4 > Lesson 4.1.1 > Problem 4-10

4-10.

Use the Power Rule to find *f *′(*x*) for *f*(*x*) = (*x* + 4)(*x* − 3) by first expanding *f*(*x*). Then, find the equation of the line tangent to *f*(*x*) at *x* = 3. Homework Help ✎

In order to find the equation of the tangent line at *x* = 3, you will need to find a point on the line and the slope at *x* =3.

To find a point, evaluate *f*(3)=_________

To find the slope, evaluate *f* '(3)= ________

Put it all together in point-slope form: *y* −*y*_{1} = *m*(*x* −*x*_{1})