已知函數y=3x^2+9x-6.當x是下列的值時,求y...唔該比條橫式我

2006-12-07 4:26 am
a x=1    b x=0  c x=b   d x=3分c

回答 (1)

2006-12-07 4:59 am
✔ 最佳答案
a.
當x = 1時,把x = 1代入函數y = 3x² + 9x - 6,得出:
y = 3(1)² + 9(1) - 6 = 3 + 9 - 6 = 6

b.
當x = 0時,把x = 0代入函數y = 3x² + 9x - 6,得出:
y = 3(0)² + 9(0) - 6 = 0 + 0 - 6 = -6

c.
當x = b時,把x = b代入函數y = 3x² + 9x - 6,得出:
y = 3(b)² + 9(b) - 6 = 3b² + 9b - 6【或 3(b² + 3b - 2)】

d.
c.
當x = c/3時,把x = c/3代入函數y = 3x² + 9x - 6,得出:
y = 3(c/3)² + 9(c/3) - 6
= 3(c²/9) + 3c - 6
= c²/3 + 3c - 6【或 1/3 * (c² + 9b - 18)】


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