问题
解答题
已知y=ax5+bx3+cx-1,当x=-2时,y=5,那么当x=2时,y=______.
答案
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.
已知y=ax5+bx3+cx-1,当x=-2时,y=5,那么当x=2时,y=______.
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.