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: 35

Answer

The graph of $f(x)=4x^2+3x-6$ has two $x-$intercepts.

Work Step by Step

The given function is $\Rightarrow f(x)=4x^2+3x-6$ Find the number of real solutions of $0=4x^2+3x-6$ $= b^2-4ac$ Substitute $4$ for $a,3$ for $b,$ and $-6$ for $c$. $= (3)^2-4(4)(-6)$ Simplify. $=9+96$ Subtract. $= 105$ Discriminant is greater than $0$, Hence, the equation has two real solutions. The graph of $f(x)=4x^2+3x-6$ has two $x-$intercepts.
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