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can someone help me on this?? i dont understand it
Yikes! A little scary, huh? Not to worry though, it's actually pretty easy. Let's take it one step at a time.
The question sounds very confusing, "the perimeter of rectangle B minus the perimeter of rectangle A"... uh.. yeah. Let's just ignore that for now and think about the perimeters separately: Perimeter of rectangle A is (we will find out) and Perimeter of rectangle B is (again, we will find that out).
So, what do we know about rectangle A? The table says that A's length is x + 8 (some number) and the width is x - 1 (some other number). Let's draw a picture so we can see what this even means.
Alright, does that picture make sense so far?
yes, it does
OK, perfect! We are almost done with the hardest part. Do you remember how to find the perimeter?
you time it by each side ??
Close, that's the area (they often get confused). :)
It's actually easier... we just add all four sides together and measure the outside of the rectangle.
(x+8) + (x-1) + (x+8) + (x-1) = 4x + 16 - 2 = 4x + 14. There that's better.
So that is the perimeter of A. Any questions on how we did that part?
OK. Now, we just do exactly the same thing for rectangle B.
We have different numbers: B width = 3x - 2 B length = 4x + 5
And, then we just add all four sides... it's a little messy, but try it and see what you get. I'll check your answer. :)
ok give me a second
sure thing. take your time. :)
Excellent! Good job!
Alright, so now we know that: Perimeter of A = 4x + 14 Perimeter of B = 14x + 6.
so subtract 14x+6- 4x+14
Good, but be careful with your parentheses. We want the whole perimeter of A to be subtracted so we need (14x + 6) - (4x + 14) in order to get the right answer.
so its 10x-8 ??
YAYYY THANKYOU SO MUCH :))
You're welcome! Good job!