Question

Direct formula of (a+b-c)^3
please help tomorrow is my exam.​

Answer 1

Answer:

What do you mean by “the” formula? There are many ways you can rewrite this.

I assume you want to expand the formula. You should be able to do that yourself with what you have already learned. For example, if you have seen a formula to expand (A+B)3 , you can use that here: you just need to realize that (a+b+c)=(a+(b+c)) , so if you let A=a and B=(b+c) you already get closer. Then, you’ll need to expand a few terms a bit more, and group terms together.

Not every algebraic expression has some formula that is given and you need to memorize. You just need to understand what you need to do and what the rules are. Here, the important rules are: “if you have something of the form a(b+c) , you can expand that to ab+ac " and “ ab=ba ". That’s all you really need.