Question

已知y=ax·x·x·x·x+bx³+cx-1,且当x=-2时,y=5则当x=2时,y的值是?

Answer 1

x=-2时 y = ax^5 + bx³+cx-1 = 5

即 a(-2)^5+b(-2)³+c(-2) = 6

即 a*2^5 + b*2³ + c*2 = -6

当 x=-2时 y = a*2^5 + b*2³ + c*2 -1 = -6-1 =-7