Answer
$-1(x-7)(x+3)$
Work Step by Step
$-x^2+4x+21$
$-1*(x^2-4x-21)$
Factors of -21: 1 and -21, 3 and -7, 7 and -3, 21 and -1
$-1*(x^2-4x-21)$
$(x^2-4x-21)$
$(x-7)(x+3)$
$x*x+3*x+x*-7+3*-7$
$x^2+3x-7x-21$
$x^2-4x-21$
$-1(x-7)(x+3)$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 6 - Section 6.3 - Factoring Trinomials of the Form ax2+bx+c - Exercise Set - Page 436: 54
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