X^2-xy 4y ---------- x ------- 12y x-y При x=7.8 a y=17

Question

X^2-xy 4y ---------- x ------- 12y x-y При x=7.8 a y=17

Answer 1

7.8^2-7.8*17-4*17=60.84-132.6-68=-139.76
12*17*7.8-17=71.4