Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 9 - Quadratic Functions and Equations - Chapter Test - Page 593: 22


$(2.61,12.61)$ and $(-4.61, 5.39)$

Work Step by Step

$y=x^2+2x-2$ and $y=x+10$ $x^2+2x-2=x+10$ $x^2+2x-12=0$ $x=(-b±\sqrt {b^2-4ac})/2a$ $x=(-2±\sqrt {2^2-4*1*-12})/2*1$ $x=(-2±\sqrt {4+48})/2*1$ $x=(-2±\sqrt {52})/2$ $x=(-2±2\sqrt {13})/2$ $x=(-1±\sqrt {13})$ $x=-1+\sqrt {13}$ $x=-1+3.6055$ $x=2.61$ $x=-1-\sqrt {13}$ $x=-1-3.6055$ $x=-4.61$ $y=x+10$ $y=2.61+10$ $y=12.61$ $y=x+10$ $y=-4.61+10$ $y=5.39$
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