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. 😐

Top | Newest First | Oldest First

DeWayfarer · 61-69, M

Not going to do your homework.

Yet the whole process is to change the way you think. The lesson is to teach you how to substitute with eventually learning how to solve for x.

It's like saying a/a=1 that's obvious. Yet why would you do that?...

x = (-b ±(√b²-4ac))/2a

is the reason.

SeductiveCactus · 26-30, F

@DeWayfarer Thanks! I kinda get it. I'll just need practice of doing it this way until it's like second nature.

Dewkissedrose · 46-50, F

It's one method to simplify a fraction as the problem is being solved as opposed to simplifying it at the end.

Taking away everything else and just focusing on the numbers you would have... 16/4. When simplifying, you are looking for the GCF anyway. 4 is the GCF. He could just as easily have written it like.. 4x4/4x1 = 4/1. I hope this helps.

Carissimi · F

It’s all the same. I would have left it at 16, and gone from there, but it’s the same answer regardless. Just do it as you would normally, but you can ask why he did it.

ProfessorPlum77 · 70-79, MVIP

He broke the 16 into 4x4 so that, instead of 16 divided by 4, you have 4x4 divided by 4. Then, he cancels out one of the 4 divided by 4's.

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.

MrAboo · 36-40, M

He explained it on the board

View 1 more replies »

MrAboo · 36-40, M

@SeductiveCactus he was canceling two 4’s he broke 16 down so he could do so. You just need to look at the work he showed, it explains your question on its own.

SeductiveCactus · 26-30, F

@MrAboo thanks for that. But obviously I didn't understand so I asked. Better to ask than not. It may seem obvious to you but it wasn't so much for me. 😊

MrAboo · 36-40, M

@SeductiveCactus that’s ok there was a time I would have had to ask too. Nothing wrong with asking

NudasPriest · 46-50, M

He's just done it to demonstrate the simplification of removing 4 from the numerator and denominator.

SeductiveCactus · 26-30, F

@NudasPriest I seeeeee. Still a bit confusing to me haha. I'll have to look it over again later to see if a fresh mind can get it.

NudasPriest · 46-50, M

@SeductiveCactus Basically, 16/4 leaves 4 on the top.

Add a comment...