hi
A negative number to the power of an even number returns a positive. So, -3^2 = 9, -3^3 = -27 and -3^4=81


2x^3 - x^2 + y where x = -3 & y = 2

2(-3^3) - (-3^2) + 2
2(-27) - (9) + 2
-54 - 9 + 2
= -61

Regards
Stuart