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Montano1993 [528]
3 years ago
14

Please help me in answers 6 and 8

Mathematics
1 answer:
Ivenika [448]3 years ago
3 0
For #6

x + y = -10
x - y = 2

First solve for y in one of the equations

x - y = 2
-y = 2 - x
y = -2 + x
y = x - 2

Now substitute into one of the equations and solve for x

x + y = -10
x + x - 2 = -10
2x - 2 = -10
2x = -8
x = -4
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Check where the first-order partial derivatives vanish to find any critical points within the given region:

f(x,y)=2x^3+y^4\implies\begin{cases}f_x=6x^2=0\\f_y=4y^3=0\end{cases}\implies(x,y)=(0,0)

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F'(t)=0\implies\begin{matrix}\sin t=0\implies t=0,\,t=\pi\\\\\cos t=0\implies t=\dfrac\pi2,\,t=\dfrac{3\pi}2\\\\16\sin^2t-3\cos t=0\implies t=2\tan^{-1}\sqrt{\dfrac{\sqrt{1033}-32}3},\,t=2\pi-2\tan^{-1}\sqrt{\dfrac{\sqrt{1033}-32}3}\end{matrix}

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We only care about 3 of these results.

t=\dfrac\pi2\implies(x,y)=(0,8)

t=\pi\implies(x,y)=(-8,0)

t=\dfrac{3\pi}2\implies(x,y)=(0,-8)

So to recap, we found that f(x,y) attains

  • a maximum value of 4096 at the points (0, 8) and (0, -8), and
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Answer:

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