已知y=ax5+bx3+cx-1,当x=-2时,y=5,那么当x=2时,y=_.
问题描述:
已知y=ax5+bx3+cx-1,当x=-2时,y=5,那么当x=2时,y=______.
答
由题意可知,当x=-2时,y=ax5+bx3+cx-1,
得y+1=ax5+bx3+cx,
即ax5+bx3+cx=6,
∴当x=-2时,ax5+bx3+cx=6,
∴当x=2时,y=ax5+bx3+cx-1=-6-1=-7.
故答案为:-7.