Question

Where does the 2x come from and why is it important?

Answer 1

I'm just a little confused how we got the 2x in each expression.

Answer 2

@AravindG @Hero @mathslover

Answer 3

2x is the sum of lengths of each side

Answer 4

Because you have the side of the picture itself, and an extra "x" on each end of that side. Each side has two ends, so 2x.

Answer 5

look closely at the figure

Answer 6

I speculated that, but I'm confused. What exactly are we finding here and why would we need the xXs?

Answer 7

because we need the total area not just area of small rectangle inside

Answer 8

to get that sides will be side of small rectangle+x+x

Answer 9

We we know the dimensions of the image are 7 by 5 inches. Alright.

And so expanding it by x dimensions on eahc side will make it equal to 80?

Answer 10

So the xs on the bottom are the width and the xs on the top are the height?

Answer 11

Yep, and since you don't know what those extra dimensions are yet, you replace them with x.

Answer 12

Ohhhhh.

Answer 13

:)

Answer 14

Thankis :)

Answer 15

yw