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

Explanation

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

\(2^{3}+2(2)=12\)

Visit our website for other GED topics now!

Related questions