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# 10分.急!*F.2 Maths { Identity & Factorization =] } 中英都得...Thx

吾該=]

Please give me some questions about Identities and Factorization. [ Including answers ]

### 1 Answer

- 1 decade agoFavorite Answer
Identity,恆等式.要去證明兩個數是否相等.

Example:

Provethat the following equation is identity.

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

L.H.S=5(x-2)

=5x-10

R.H.S=2(x-5)=3x

2x-10=3x

=5x+10

L.H.S=R.H.S

answer: 5(x-2)=2(x-5)+3x ====個等號要三條線.

Prove that 3(x+1)+2(3x-5)=6(x-1)+10 is NOT identity.

L.H.S=3(x+1)+2(3x-5)

=3x+3+6x-10

6x+4

L.H.S.=R.H.S ====個等號中間要有條斜線.

3(x+1)+2(3x-5)=6(x-1)+10 is not identity.

Factorization.因式分解.

Example:

Factorize 14y^4 + 21y^3 -7y^2

= 7y^2 (2y^2) + 7y^2 (3y)-7y^2(1)

answer =7y^2 (2y^2+3y-1)

我都係讀緊中2,啱啱教完.Hope that can help you.