Factor or square root equation

I have an equation for the following, can someone please verify if I have the correct answer.

Equation:

$$12x^2 = 147$$

I used square root formula

Answer x=3.5

Would factoring be better

As far as I got was:

$$ (4)(3)x^2 = (49)(3)$$

Divide both sides by 3:

$$4x^2 = 49$$

Then Squared both sides to get: 2x = 7
x = 3.5

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