Question

8x³-7xy, para x = 2 e y - 3

Answer 1

$8 \times {2}^{3} - 7 \times2 \times ( - 3) = \\ 8 \times 8 - 14 \times ( - 3) = \\ 64 - ( - 42) = \\ 64 + 42 = \\ 106$

Answer 2

8x^3-7 xy

8 (2)^3-7 (2)(-3)

8 (8)-14 (-3)

64+42

106

o valor vai ser 106.