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: 31

Answer

The graph of $y=-x^2+x-6$ has two $x-$intercepts.

Work Step by Step

The given function is $\Rightarrow y=x^2+5x-1$ Find the number of real solutions of $0=x^2+5x-1$ $= b^2-4ac$ Substitute $1$ for $a,5$ for $b,$ and $-1$ for $c$. $= (5)^2-4(1)(-1)$ Simplify. $= 25+4$ Subtract. $= 29$ Discriminant is greater than $0$, Hence, the equation has two real solutions. The graph of $y=-x^2+x-6$ has two $x-$intercepts.
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