5xy * (3x + 4y - 7) - 3y * (xy - x ^ 2 + 9) - 8 for , x = 2 y = - 1
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5xy * (3x + 4y - 7) - 3y * (xy - x ^ 2 + 9) - 8 for ,
x = 2 y = - 1
5xy * (3x + 4y - 7) - 3y * (xy - x ^ 2 + 9) - 8
= 5*2*(-1)*(3*2-4*1-7) + 3(-2-4+9) - 8
= -10*(6-4-7) + 3*(3) - 8
= - 10(-5)+9-8
= 50+1
= 51
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