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Mathematics 1
Mathematics 1 Deneme Sınavı
Mathematics 1 Deneme Sınavı Sorusu #1219665
Mathematics 1 Deneme Sınavı Sorusu #1219665
Which of the following is the local minimum point of the function f (x, y) = x2 + 2 y2 + 2 x + 3 y ?
(3, 5) |
(-1, -4) |
(3 / 5, 1) |
(-2, -3 / 4) |
(1, 2 / 3) |
Yanıt Açıklaması:
?f / ?x = 2x + 2 = 0 ; x = -2 ; ?f / ?y = 4 y + 3 = 0 ; y = -3 / 4 ; a = ?2f / ?x2 = 2 > 0 ; b = ?2f / ?y2 = 2 ; c = ?2f / ?x ?y = 0 ; D = a . b – c2 = 2 . 2 – 0 = 4 > 0 ; pg. 192. Correct answer is D.
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