Variation?

👨🏻‍🏫 學術台數學

Smile

2018-09-28 10:48 am

y=2x,^2+12x and x=2 and x=-8when y=32.=how to find the mini. Value of y

回答 (1)

螞蟻雄兵

2018-09-28 12:53 pm

✔ 最佳答案

Sol
y=2x^2+12x
=2(x^2+6x)
=2(x^2+6x+9)－18
=2(x+3)^2－18
0<=(x+3)^2
0<=2(x+3)^2
－18<=2(x+3)^2－18
－18<=y

👍 2 👎 0

收錄日期: 2021-04-24 01:10:48
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20180928024818AAiiEZV

檢視 Wayback Machine 備份