Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 1 - Introduction to Algebraic Expressions - 1.8 Exponential Notation and Order of Operations - 1.8 Exercise Set: 81

Answer

$-17$

Work Step by Step

Substituting $ a $ with $ 5 $ in the given expression, $ \dfrac{3a-4a^2}{a^2-20} $, then, \begin{array}{l}\require{cancel} \dfrac{3(5)-4(5)^2}{(5)^2-20} \\\\= \dfrac{15-4(25)}{25-20} \\\\= \dfrac{15-100}{5} \\\\= \dfrac{-85}{5} \\\\= -17 .\end{array}
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.