Answer
12 is co-efficient of $x^{2}$
Work Step by Step
4x(5$x^{2}$+3x+7)
(4x$\times$5$x^{2}$)+(4x$\times$3x)+(4x$\times$7)
20$x^{3}$+12$x^{2}$+28x
The co-efficient of $x^{2}$ is the number that goes with it which is 12.
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 8 - Polynomials and Factoring - 8-2 Multiplying and Factoring - Practice and Problem-Solving Exercises - Page 496: 44
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