College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter R - Section R.5 - Factoring Polynomials - R.5 Assess Your Understanding - Page 57: 76


number to be added: $4$ factored form: $(x-2)^2$

Work Step by Step

RECALL: To complete the square of an expression in the form $x^2-bx$, $(\frac{b}{a})^2$ must be added. The factored form of the result is $(x-\frac{b}{2})^2$. Thus, in the given expression add $(\frac{4}{2})^2=2^2=4$ to obtain: $x^2 -4x + 4$ Writing the square in factored form gives: $x^2-4x+4 = (x-2)^2$
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