Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 5 - Exponents and Polynomials - 5.3 - Multiplying Polynomials - Problem Set 5.3 - Page 208: 116

Answer

$x^{3}$ - 3$x^{2}$ + 3x - 1

Work Step by Step

$(x - 1)^{3}$ = (x - 1)(x - 1)(x - 1) = Remember that $(a-b)^{2}$ = $a^{2}$ - 2ab + $b^{2}$ So, (x - 1)(x - 1)(x - 1) = ($x^{2}$ - 2$\times$x$\times$1 + $1^{2}$)(x - 1) = ($x^{2}$ - 2x + 1)(x - 1) = Use the distributive property. $x^{2}$(x) +$x^{2}$(-1) -2x(x) -2x(-1) +1(x) +1(-1) = $x^{3}$ - $x^{2}$ - 2$x^{2}$ + 2x + x - 1 = Simplify. $x^{3}$ - 3$x^{2}$ + 3x - 1
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