Factorization F.2

a(x+1)+b(x+1)-2(x+1)
=(a+b-2)(x+1)

(x+1)(x+3)

(2x-1)(x+5)

1. bx+ax-2x+b+a-2



=x(b+a-2) +(b+a-2)



=(x-1)(a+b-2)//



2. x^2+4x+3



= (x^2+3x)+x+3



=x(x+3)+(x+3)



=(x+1)(x+3)//


2009-11-03 19:23:16 補充：
3)
2x^2 + 9x - 5



(2x - 1)(x + 5)

2009-11-03 19:43:46 補充：
3. 2x^2 + 9x - 5

=2x^2 +10x-(x+5)

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

=(2x-1)(x+5)//

1)
bx + ax - 2x + b + a - 2
(x + 1)b + (x + 1)a - (2x + 2)
(x + 1)(a + b) - 2(x + 1)
(x + 1)(a + b - 2)

2)
x^2 + 4x + 3
(x + 3)(x + 1)

3)
2x^2 + 9x - 5
(2x - 1)(x + 5)

You can use calculator in no.2,3

(b+a-2)(x+1)

(x+3)(x+1)

(x+5)(2x-1)

1) bx+ax-2x+b+a-2
=bx+b+ax+a-2x-2
=b(x+1)+a(x+1)-2(x+1)
=(b+a-2)(x+1)
之後你慢慢研究la
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