College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 2, Functions - Focus on Modeling - Modeling with Functions - Problems - Page 277: 14

Answer

The product of two positive numbers can be given by the following function: $P(x)$ = $60x - x^{2}$, $x\gt0$

Work Step by Step

To find a function that expresses $P$, the product of two numbers, we need to set up the equation: $P(x)$ = $xy$ We also know that the sum of those two positive numbers is $60$, so we can set up an equation for this statement as well: $x + y$ = 60 We can solve for $y$ to get $y$ in terms of $x$. We subtract x from both sides: $y$ = $60 - x$ Now, we can plug in what we got for $y$ into the equation to find the product of the two numbers: $P(x)$ = $(x)(60 - x)$ We then distribute the terms to simplify the function: $P(x)$ = $60x - x^{2}$
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