Love when my lecturer doesnt explain why he changed the 16 into 4x4. 🤯🤯🤯

Like I get that 4x4 is 16, but he just did it without explanation. Now I'll have to go in and get him to explain it to me in person cause I missed the lecture and couldn't ask live. 🤯🤯🤯
CONFUSED. If anyone knows please do explain it to my idiotic self. This class has me second guessing myself and it was just meant to be a revision class of highschool maths HAHAHAH. 😐

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DunningKruger · 61-69, M

He refactored it so that he could just mark off a 4 in both the numerator and the denominator. Basically, he just cut out a step because he (incorrectly with you, at least) assumed that what he was doing would be obvious.