Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Entry-Level Assessment - Page xxxviii: 34

Answer

$$\text{H}$$

Work Step by Step

The $x$-intercepts of a parabola can be found by setting $y=0$ then solving for $x$: \begin{align*} y&=6x^2-4x-3\\ 0&=6x^2-4x-3\\ \end{align*} Recall: The discriminant $b^2-4ac$ can tell the number of solutions/roots of a quadratic equation. (1) If $b^2-4ac >0$, then the quadratic equation has two real roots. (2) If $b^2-4ac<0$, then the quadratic equation has no real roots. (3) If $b^2-4ac=0$, then the quadratic equation has one real solution. The quadratic equation above has $a=6, b=-4,$ and $c=-3$. Find the determinant to obtain: \begin{align*} b^2-4ac&= (-4)^2-4(6)(-3)\\ &=16+72\\ &=88 \end{align*} The discriminant is greater than $0$ therefore the quadratic equation has $2$ real roots. The roots of a quadratic equation are also its $x$-intercepts. Thus, the given parabola has $2$ $x$-intercepts.
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