×

PA

Additional Maths - concave

Q34. What is the complete set of numbers for which f(x) = x3 + 2x2 – x is concave?

x ≥ −2/3
x ≥ −3/2
x ≥ 3/2
x ≥ 1
None of the above

解答 0

  • 解數雜貨店
    2020-09-01 12:01:34
    f(x) = x³+2x²-x f'(x) = 3x²+4x-1 f''(x) = 6x+4 Concave means that the slope is decreasing. So, f''(x) ≤ 0 6x+4 ≤ 0 x ≤-2/3

    附加文件

請填寫內容
解答內容包含禁止的詞
請輸入你的答案
上載文件更改 ×
檔案過大
不支援此檔案
jpg, gif, png, doc, docx, pdf, xls, mov, mp4, m4a, mp3 (檔案上限為50M)