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# Mathematics Use of Formulae

1. (a) a(b-c)

(b) 2x^2+x-15

(c) Using the results of (a) and (b), and let a = 2x, b = x+3 and c = 5,

factoriza 2x^2+x-15.

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### 1 Answer

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- babaLv 51 decade agoFavorite Answer
用(a)和(b)的結果，而且讓a = 2x, b = x+3 and c = 5，將2x^2+x-15作因式分解

題目的意思是2x^2+x-15因式分解後，用a = 2x, b = x+3 and c = 5取代之

2x^2+x-15 (十字交叉)

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

= b (a-c)

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