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Sagot :
The error was the he multiply k by k and 4 by 4, that is incorrect, he must multiply k by k and by 4 and then multiply 4 by k and by 4.
It is a binomial squared
k + 4
x k + 4
k^2 + 4k
4k + 16
k^2 + 8k + 16 This is the final result
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