If \(4 x^{2}-7=9\), what is the value of \(x^{3}+2 x\)?


To solve this, you must first solve for x.
1. Add 7 to both sides: \(4 x^{2}=16\)
2. Divide the 4 off: \(x^{2}=4\)
3. Square root both sides: x = 2
Now we need to solve for the other equation using the value of 2 for x

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