Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Review - Concept Check - Page 133: 22

Answer

$$b^{2}-(4ac)$$ No real solution.

Work Step by Step

What is the discriminant of the quadratic equation $ax^{2}+bx+c=0$? We can find the discriminant in the quadratic equation. It is the part that is in the square root. $$b^{2}-(4ac)$$ If $b^{2}-(4ac) \gt0$ There are two real solutions. If $b^{2}-(4ac) =0$ There is only one real solution. If $b^{2}-(4ac) \lt0$ The roots can’t be calculated, they are imaginary or non real. Find the discriminants of $2x^{2}-3x+5=0$. How Many real solutions does this equation have? $$(-3)^{2}-(4(2)(5)$$ $$9-40$$ $$-31$$ It has no real solution.
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