Answer
Two
Work Step by Step
$x^2-k^2=0$
$x^2+xk-xk-k^2=0$
$x(x+k)-k(x+k) =0$
$(x-k)(x+k) = 0$
$x-k =0$
$x-k+k = 0+k$
$x = k$
$x+k =0$
$x+k-k = 0-k$
$x = -k$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 9 - Quadratic Functions and Equations - 9-4 Factoring to Solve Quadratic Equations - Practice and Problem-Solving Exercises - Page 558: 37
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