Elementary Algebra

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

Chapter 10 - Quadratic Equations - 10.3 - Quadratic Formula - Problem Set 10.3 - Page 453: 40


The equation does not have any real solutions

Work Step by Step

Step 1: Comparing $3t^{2}+6t+5=0$ to the standard form of a quadratic equation, $at^{2}+bt+c=0$, we find: $a=3$, $b=6$ and $c=5$ Step 2: The quadratic formula is: $y=\frac{-b \pm \sqrt {b^{2}-4ac}}{2a}$ Step 3: Substituting the values of a, b, and c in the formula: $y=\frac{-(6) \pm \sqrt {(6)^{2}-4(3)(5)}}{2(3)}$ Step 4: $y=\frac{-6 \pm \sqrt {36-60}}{6}$ Step 5: $y=\frac{-6 \pm \sqrt {-24}}{6}$ Step 6: Since $\sqrt {-24}$ is not a real number, the equation does not have any real solutions.
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