it says 2x square -16  but in the video it says x square -16 problem 1

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Where does it say 2x^2 - 16? Remove the greatest common factor, which is 2. Then divide each term by 2. 2x^2 divided by 2 = x^2 Now, -16 divided by 2 = -8 2x^2 - 16 factors out to be 2(x^2 - 8).