Question

find the product:
(x-y)(x+5y)

Answer 1

Are you familiar with polynomial multiplication? FOIL?

Answer 2

Yep, FOIL should the the trick, are you familiar with it?

Answer 3

F - FIRST
O - OUTER
I - INNER
L - LAST

Answer 4

2x^2+5xy-xy-5y ?

Answer 5

Close, but you missed something on that 5y and then combined like terms.

Answer 6

5y^2 ? then t combine it would it be just 5 ?

Answer 7

or 4xy ?

Answer 8

No, , because it is multiplied it is 5yx, so xy+xy+xy+xy+xy-xy

Answer 9

Ah, you fixed it. 4xy, yes.

Answer 10

\(x^2+4xy-5y^2\)

Answer 11

so 2x^2+4xy-5y^2

Answer 12

/cheer Yep.

Answer 13

\[(x-y)(x+5y)\]
\[x^2+4 x y-5 y^2\]

Answer 14

Wait... whre did that 2 in front come from? Ummm... Noticed it at the last moment. The x is just squared out fron, no 2. K?

Answer 15

@e.mccormick yeah @xcaseynoel kind of wrote it wrong; she messed up on the 2 in the front...

Answer 16

First \(\times\) First = \(x^2\), Inner \(\times\) Inner = -xy, Outer \(\times\) Outer = \(5xy\), and Last \(\times\) Last = \(-5y^2\)
That is what the whole FOIL thing is about.