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OpenStudy (anonymous):
Minimize 3x^2+4y^2, where x+y=7
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OpenStudy (raden):
x+y=7 ---> y=7-x let k = 3x^2+4y^2 = 3x^2+4(7-x)^2 = 3x^2 + 4x^2-56x +196 = 7x^2-56x+196 k will be minimum when x=-b/2a
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