Answer
$A=6x^2+20x$
Work Step by Step
The area of a triangle is
$A=\frac{1}{2}bh$
The base of the triangle is
$b=4x$
while the height is
$h=3x+10.$
We calculate the area:
$A=\frac{1}{2}(4x)(3x+10)$
$=(2x)(3x+10),$
$=6x^2+20x$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 5 - Section 5.2 - Multiplying Polynomials - Exercise Set - Page 360: 102
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