Answer
$88$
Work Step by Step
Start with given expression: $x^{2}+3x,x=8$.
Substitute $8$ in for $x$: $8^{2}+3(8)$.
Simplify for answer: $64+24=88$.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Section P.1 - Algebraic Expressions, Mathematical Models, and Real Numbers - Exercise Set - Page 17: 5
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