stuck on this.
#How do you do C?
blissful wadi
im very confused
A) Original area was x^2
New area is x(x+b)=(x^2+3x)
So x^2+xb=x^2+3x so new width is x+3
B) l=x+1, b=x-1
New perimeter is 2(x+1)+2(x-1)=4x so no change in perimeter
But
New area is (x+1)(x-1)=x^2-1
Which is less than og
thsi is answer to A and B as provided by boris
nimble nebula
In case c we have perimeter is 4x+8
And length l=x+7
So say width w=x-c
Perimeter is 2(x+7)+2(x-c)=4x+14-2c compare this to the given perimeter and you get 14-2c=8 so c=3
So new width is x-3
i) So change made to width is -3
ii) new area is (x-3)(x+7)
iii) If x equals three that width goes to zero so the pen is no longer a rectangle it's just a line and the cute pigs have nowhere to live 
blissful wadi
In case c we have perimeter is 4x+8
And length l=x+7
So say width w=x-c
Perim...
where did oyu get width = X-c, what is X and C? also how did oyu get the perimetre?
gaunt basalt
x is the original length of the pen
c is a variable to solve for
perimeter is l + w + l + w = 2l + 2w
blissful wadi
Oh ok, but how did you get the perimetre = 4x+8?
gaunt basalt
because in b, the perimeter is 4x
and in c it says the perimeter needs to increase by 8
nimble nebula
Did you get it @blissful wadi
blissful wadi
Did you get it <@846694858210148362>
OHHH
yeah I get it
can you guys help me with 2E as well?
orchid sailBOT
nimble nebula
X can't be -25 ofc so 5
blissful wadi
,w 500=2*(20*x+x*(20+2x))
can u pls, like explain it to me?
cause im kinda confused on that
hidden adder
can you guys help me with 2E as well?
note that we can express the area of the moat by ...?
the big square - 400 (small square)
now write an equation using x thats equal to 500
blissful wadi
ok yes
blissful wadi
,w 500=2*(20*x+x*(20+2x))
can you just expand this out, and explain your every step? and where you got each number from? where did you get 2(20x+x*(20+2x))?
hidden adder
so whats the side length of the big square
well a simpler way to think about this is
area of big square - area of small square = area of the shaded
side length of big square is 20+2x
can probably see why
small square has area 400
so
,w (20+2x)^2-400=500
orchid sailBOT
hidden adder
can you just expand this out, and explain your every step? and where you got eac...
so boris divided it into 4 rectangles
note that there are 2 of each type
the smaller one has area 20x
the larger, x(20+2x)
i still like mine more
nimble nebula
so boris divided it into 4 rectangles
Yup that's what I did
But redcliff follow what Samoyed dude just said you'll find that easier
blissful wadi
ohhhh ok