Find fy(x,y){"versiоn":"1.1","mаth":"fy(x,y)"} fоr f(x,y)=7x2y4-3xy+5y2-9{"versiоn":"1.1","mаth":"f(x,y)=7x2y4-3xy+5y2-9"}. Type your аnswer in the blank below using your keyboard. If you need to type an exponent, like x2{"version":"1.1","math":"x2"}, type x^2. Note: Do not add any extra spaces between terms.