Expand ( x - 1/x^2)^4

We want to expand the expression:

We can just do it by brute force, this is:

First, rewrite our expression as the product of two square factors:

Now we can expand each one these two factors:

That can be simplified to

Now we can replace that in our original expression to get:

Now we can expand that last product, to get:

We can simplify that to:

That is the expanded expression.

there are 70 more legs than eyes at the dog show (196 – 126 = 70). dogs have two more legs than eyes, and humans have the same number of legs as eyes. thus 70 is twice the number of dogs at the show, so the number of dogs is half of 70, which is 35. to get the number of humans, subtract 35 from 63: 63 – 35 = 28.

step-by-step explanation: