Duration: 4:58

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Here is the mistake: When I take the square roots of both sides, I get plus or minus terms. But in the video, I only take the plus terms of both sides. But if I take plus term of a side and minus term of a side, it will match. So the plus minus terms confuses you, you don't know what do you take. Do you take plus terms of both sides? Or do you take plus term of a side and minus term of a side?

So the mistake is that I don't write "plus or minus" after taking the square roots of both sides. I just take the positive terms. For that, I get 2 =3. But if I take the positive term of a side and the negative term of the other side, I'll get 5 = 5 or -5 = -5 that is true.