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taylorlindsey9329
01.08.2019 •
Mathematics
He function f(x,y)equals5 x plus 5 y has an absolute maximum value and absolute minimum value subject to the constraint 9 x squared minus 9 xy plus 9 y squared equals 4. use lagrange multipliers to find these values.
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Ответ:
You're looking for extrema of
subject to
.
The Lagrangian is
with critical points where
Substituting
into
gives you
So you get two critical points,
and
.
Ответ:
Option (3)
Step-by-step explanation:
Option (1),
3x⁴ + 26x² - 9
=
[For x =
]
= 3(9i⁴) + 26(3i²) - 9
= 27 - 78 - 9 [Since i² = -1]
= -60
Option (2),
4x⁴- 11x² + 3
=![4(i\sqrt{3})^4-11(i\sqrt{3})^2+3](/tpl/images/0716/5417/6006c.png)
= 4(9i⁴) - 33i² + 3
= 36 + 33 + 3
= 72
Option (3),
4x⁴ + 11x² - 3
=![4(i\sqrt{3})^4+11(i\sqrt{3})^2-3](/tpl/images/0716/5417/a9297.png)
= 4(9i⁴) + 33i² - 3
= 36 - 33 - 3
= 0
Option (4),
=![3(i\sqrt{3})^4-26(i\sqrt{3})^{2}-9](/tpl/images/0716/5417/dd0d8.png)
= 3(9i⁴) - 26(3i²) - 9
= 27 + 78 - 9
= 96
Therefore,
is a factor of option (3).