### Home > CALC > Chapter 7 > Lesson 7.4.1 > Problem 7-177

7-177.

Use point-slope form of a line. *f*(1) will give you the point, and *f* '(1) will give you the slope.

Since a linear equation is easier to evaluate than a 4th-degree polynomial, use the tangent line to approximate *f*(1.1).

Is the graph of *y* = *f*(*x*) concave up or down *x* = 1?