Not big error but i noticed a calculation mistake here

I don’t see the error?

if k is 1 then inside the bracket will be 3 not 4. Greg has multiplied it by 4 in bracket

In option C, right?

yes adding inside the bracket gives 3 while x^2 = 1/9 which gives 1-1/3 = 2/3

Indeed, we’ve made a note below the video.

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