College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 1, Equations and Graphs - Section 1.9 - Solving Equations and Inequalities Graphically - 1.9 Exercises - Page 158: 12

Answer

No solution

Work Step by Step

Solve algebraically: $x^2+3=2x$ (Substract with $2x$) $x^2-2x+3=0$ Let us check the discriminant. $D=b^2-4ac=(-2)^2-4\cdot 1\cdot 3=4-12=-8<0$. Since $D<0$, the equation has no real solution. Solve graphically: We sketch the graphs of $y_1=x^2+3$ and $y_2=2x$ as shown below. Both do not intersect at any point. So, the equation has no solution.
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