Question

find the product
(2x^2-9y)(2x^2+9y)

Answer 1

Multiply each term in the first group by each term in the second group using the FOIL method. FOIL stands for First Outer Inner Last, and is a method of multiplying two binomials. First, multiply the first two terms in each binomial group.

Next, multiply the outer terms in each group, followed by the inner terms.

Finally, multiply the last two terms in each group.
4x^(4)-81y^(2)

Answer 2

so like 4x^4 and 18xy^2

Answer 3

Its quite hard to explain here, but this video might help
http://www.youtube.com/watch?v=zSq56JFEu7Q

Answer 4

This is called a difference of squares

Answer 5

what