Find the x - intercepts of the following function:

$f\left( x \right) = { 24x }^{ 2 } - 10x - 21$

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2016 Problems
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We know that the product of roots of $ax^{2}+bx+c$ is $c/a$ , so multiply the denominators of the roots in options. Only 1 option leads us $24$ . Thats the answer!