document.write( "Question 634516: Let f (x, y) = x2 + 2xy + 2y2 − 6y + 2. Find and identify all relative max’s and
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Algebra.Com's Answer #399762 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "f(x, y) = x^2 + 2xy + 2y^2 -6y + 2
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document.write( "∂ f/∂ x = 2x + 2y
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document.write( "∂ f/∂ y = 4y + 2x - 6
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document.write( " 2x + 2y = 0
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document.write( " 2x + 4y = 6
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document.write( "    2y = 6
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document.write( "     y = 3   and x = -3
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document.write( " = 2
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document.write( " = 2
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document.write( " = 4
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document.write( "D =  
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document.write( "f(x,y) has minimum at (-3,3) 
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document.write( "f(-3, 3) = 9 -18 +18 -18 + 2 = -7 \n" );
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