唔該教下我呢條數學問題

2008-12-30 1:54 am

(5x+3)(2x-6)=0
寫埋d步驟出

回答 (5)

2008-12-30 4:40 am

(5x+3)(2x-6)= 10x^2-24x-18 = 0
運用 factor theorem 可知 x = - 3 / 3 , -3/5 / 3/5

參考: 自己

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2008-12-30 3:03 am

這是一題 quadratic equation
(5x+3)(2x-6)=0
5x+3 = 0 or 2x-6 = 0
5x = -3 or 2x = 6
x = -3/5 or x = 3

參考: 自己計

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2008-12-30 2:19 am

5x(2x-6)+3(2x-6)=0

10x^2-30x+6x-18=0

最後答案:10x^2-24x-18= 0

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2008-12-30 2:03 am

5x(2x-6)+3(2x-6)=0,

10x*2-30x+6x-18=0,

10x*2-24x-18=0

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2008-12-30 1:59 am

(5x+3)(2x-6)=0

so 5x+3=0 or 2x-6=0
x=-3/5 or 3

參考: me

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