* Question Completion Status: X P * SPAN 12 WORDS POWERED BY TINY ESTION 6 15 points Save Answer Consider f (x, y ) = 4x4+12 -2xy+ 1 Evaluate D = f f yy - [fx] at (0,0)? What can you say? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 10pt Ev V Av SIX ... x2 X2 ABC v V TT ( + X E P O WORDS POWERED BY TINY QUESTION 7 8 points Save Answer Find the first-order partial derivatives of 9x - 1ly f ( x, y ) = - 6x + 5y For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial V 10pt V EVAVAI ... Priva Tern Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Save and Submit ACCE