Substituting x = 3 into the first expression:
-4(3) - 8 = -12 - 8 = -20
Substituting x = 3 into the second expression:
-2(3 + 1) - 2(3 + 3) = -2(4) - 2(6) = -8 - 12 = -20
Let

and

be the sides of the rectangle. The perimeter is given to be 500m, so we are maximizing the area function

subject to the constraint

.
From the constraint, we find

so we can write the area function independently of

:

Differentiating and setting equal to zero, we find one critical point:

which means

, so in fact the largest area is achieved with a square fence that surrounds an area of

.
Step-by-step explanation:
✰ 
- AD = 15 , AB = 8 ,
DAB
✰ 
- Height & Area of the given parallelogram
✰ 
In right angled triangle ABE :
- Hypotenuse ( h ) = 8
- Perpendicular ( p ) = h [ height ]
= 20°
Now , Using trigonometric ratio :

Plug the known values :
⟶ 
⟶ 
⟶ 
⟶ 
Now , We have :
- Base ( b ) = 15
- Height ( h ) = 2.72
Finding the area of a parallelogram whose base and height are 15 and 2.72 respectively :
❀ 
⟶ 
⟶ 
Hence , Our final answer :


Hope I helped ! ♡
Have a wonderful day / night ! ツ
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Let's solve it step-by-step:
25 + 20 = 45
45 + 45 = 90
90 + 34 = 124
124 + 21 = 145
Therefore:
25 + 20 + 45 + 34 + 21 = 125
Hope it helped,
BioTeacher101
I believe the answer would be 1086.4
Please give a like if I’m right and tell me in the comments if I’m wrong.
Hope this helped :)