Big Ideas Math - Algebra 1, A Common Core Curriculum

Published by Big Ideas Learning LLC
ISBN 10: 978-1-60840-838-2
ISBN 13: 978-1-60840-838-2

Chapter 9 - Solving Quadratic Equations - 9.5 - Solving Quadratic Equations Using the Quadratic Formula - Exercises - Page 521: 15

Answer

$x=\frac{3}{2}$ and $x=\frac{2}{3}$

Work Step by Step

$6x^{2}-13x=-6\implies 6x^{2}-13x+6=0$ Comparing $6x^{2}-13x+6=0$ with $ax^{2}+bx+c=0$, we get $a=6$, $b=-13$ and $c=6$. The quadratic formula is $x=\frac{-b \pm \sqrt {b^{2}-4ac}}{2a}$ Substituting the values, we get $x=\frac{-(-13) \pm \sqrt {(-13)^{2}-4(6)(6)}}{(2)(6)}=\frac{13\pm 5}{12}$ The solutions of the equation are $x=\frac{13+5}{12}=\frac{18}{12}=\frac{3}{2}$ and $x=\frac{13-5}{12}=\frac{8}{12}=\frac{2}{3}$
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