二次函数y=2x2-4x+3通过配方化为顶点式为y=______,当x______时,y随x的增大而增大.
人气:235 ℃ 时间:2019-11-21 20:00:45
解答
∵y=2x2-4x+3=2(x2-2x+1)-2+3=2(x-1)2+1,
∴当x>1时,y随x的增大而增大.
故答案为2(x-1)2+1,>1.
推荐
猜你喜欢
- 今天有个题目是,__like that,remind me of your father,sit,还是sitting?
- Don't play football in the s( ) .It's dangerous.
- 某人用250N的推力,把重1000N的物体沿长5m,高1m的斜面,由底端匀速推到顶端,在这一过程中,推力做的有用功是多少?此斜面的机械效率是多少
- 一元二次方程ax2+bx+c=0(a≠0)中的二次项系数,一次项系数,常数项系数之和为0
- You need to exercise to keep you fit.(对画线部分提问) (exercise 为画线部分)
- ---A single room ,please.---OK.Will you please____me your ID card?----Here you are.
- The book you borrowed from the library should been returned in five days.
- 已知向量a=(2cosα,2sinα),b=(3cosβ,3sinβ),若向量a与b的夹角为60°,求cos(α-β)的值.