Chapter 13 - A Preview of Calculus: The Limit, Derivative, and Integral of a Function - Section 13.4 The Tangent Problem; The Derivative - 13.4 Assess Your Understanding - Page 916: 2

False

In order to find the correct answer, we must put a $-$ sign in the numerator and denominator instead of a $+$ sign. The final equation will look like this: $\dfrac{f(b)-f(a)}{b-a}$ (See page 916 of the book.) So, the given statement is False.