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F.3升F.4 maths questions 40 pts

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1. A) Factorize X^3-8 B) Using the result in (A), Factorize X^3-7x+6 (Hint: X^3-7x+6= X^3-8+_____) 2. The salary tax of Mosses this year is $7200. If he is entitled to $130000 allowance, find his total annual income. 更新: 應課稅入息實額 $稅率稅款 %$ 最初的40,00040,000 2 800 800 其次的40,00080,000 72,8003,600 其次的40,000120,000124,8008,400 餘額17 稅款（按累進稅率計算） 40,000 按 2%計算 = 800 40,000 按 7%計算 = 2,800 40,000 按12%計算 = 4,800 餘下 按17%計算 = 更新 2: Thanks! 更新 3: the salary tax rate

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最佳解答:

1. A) Factorize X^3-8 X^3 - 8 = X^3 - 2^3 = (X-2)(X^2 + 2X + 4) B) Using the result in (A), Factorize X^3-7X+6 (Hint: X^3-7X+6= X^3-8+_____) X^3-7X+6 = X^3 - 8 + 14 - 7X =(X-2)(X^2 + 2X + 4) - 7(X-2) =(X-2)(X^2 + 2X + 4-7) =(X-2)(X^2 + 2X - 3) =(X-2)(X-3)(X+1) 2. The salary tax of Mosses this year is $7200. If he is entitled to $130000 allowance, find his total annual income. Can you list the salary tax rate? 2010-08-07 21:31:21 補充： 2. The salary tax of Mosses this year is $7200. If he is entitled to $130000 allowance, find his total annual income. Let $x be his total annual income, (x-130000-40000-40000)*12% = 7200-800-2800 (x-210000) = 30000 x = 240000 His annual income is $240000 2010-08-07 21:31:38 補充： Thz for your information

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