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17.10.2019 •
Mathematics
Someone answer 10 11 and 12 with a simple explanation
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Ответ:
Ответ:
the rectangle of maximum area is a square with side length x=y= p/4
Step-by-step explanation:
Since
A = f(x,y) = x*y
p= g(x,y)= 2*x+2*y
therefore using Lagrange multiplier →λ
F(x,y) = f(x,y) - λ*g(x,y)
and
Fx(x,y) = fx (x,y) - λ*gx(x,y) = 0
Fx(x,y) = fy (x,y) - λ*gy(x,y) = 0
g(x,y) = p
where fx and gx are the partial derivatives with respect to x and fy and gy are the ones of y
therefore
fx (x,y) - λ*gx(x,y) = y - λ*2 = 0 → y = 2λ
fy (x,y) - λ*gy(x,y) = x - λ*2 = 0 → x = 2λ
2*x+2*y = p → 2*2λ + 2*2λ = p → 8λ = p → p/8=λ
therefore
x = y = 2λ = 2*p/8 = p/4
A max = x*y = p/4 * p/4 = p²/16
since the side x = side y → the rectangle of maximum area is a square with side length = p/4