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Math·Advanced Math·Equivalent expressions

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$$b^2+4c=7d$$The given equation relates the real numbers $b$, $c$, and $d$, where $d>4$. Which equation correctly expresses $b$ in terms of $c$ and $d$?

A

$b=7d+4c$

B

$b=7d-4c$

C

$b=\pm \sqrt{7d+4c}$

D

$b=\pm \sqrt{7d-4c}$