Answer
$a^{2}$ + 9a + 20
Work Step by Step
( a + 5 ) ( a + 4 ) use the commutative and associative properties multiply
(a)(a) +(a)(4) +( 5)(a) + (5)(4) FOIL method
$a^{2}$ + 4a + 5a + 20
$a^{2}$ + 9a + 20
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.6 - Special Products - Exercise Set - Page 388: 57
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