## Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole

# Chapter 13 - Section 13.3 - Tangent Lines and Derivatives - 13.3 Exercises: 21

7

#### Work Step by Step

If $f(x) =x-3x^2$, then $f'(x) = 1-6x$ $f'(-1) = 1-6 \times (-1) = 7$

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