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Math·Advanced Math·Equivalent expressions

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The expression $6x^4+17x^2+5$ can be rewritten as $(3x^2+a)(2x^2+b)$, where $a$ and $b$ are positive integers, or as $(3x^2+c)(2x^2+d)$, where $c$ and $d$ are positive nonintegers. What is the value of $a/c$?

1

2/15

2

.1333

3

0.133