a=1
a>1
Factor by Grouping
100

x2 + 8x + 15

(x + 3)(x + 5) 
100

2x2 + 13x + 15

(2x + 3)(x + 5)
100

5x3 + 10x2 + 2x + 4

(x + 2)(5x2 + 2)

200

x2 + 14x + 40

(x + 10)(x + 4)
200

3x2 +13x + 12

(3x + 4)(x + 3)
200

6x3 + 9x2 + 8x + 12

(2x + 3)(3x2 + 4)

300

x2 + 3x - 18

(x + 6)(x - 3)
300

2x2 + 3x - 20

(2x - 5)(x + 4)
300

10x3 + 15x2 - 6x - 9

(2x + 3)(5x2 - 3)

400

x2 - 9x + 20

(x - 5)(x - 4)
400

8x2 + 14x + 3

(4x + 1)(2x + 3)
400

14x3 - 21x2 - 2x + 3

(2x - 3)(7x2 - 1)

500

x2 - x - 72

(x - 9)(x + 8)
500

12x2 - 23x + 10

(3x - 2)(4x - 5)
500

16x3 + 8x2 + 12x + 6

2(2x + 1)(4x2 + 3)