x3+8x+2.
x3 + 8 = x3 + 23recall thatx3 + y3 = (x+y)(x2 - xy + y2)x = x, y = 2x3 + 8 = (x+2)(x3 - 2(x) + 22)
x3+8x+2=(x+2)(x3−2(x)+22)x+2 → x2 - 2x + 4
x = -2(-2)2 - 2(2) + 4 = 4 - 4 + 4
= 4