Easy
Medium
Easy
Medium
Challenge
100
(x+3) (x+5)
x^2 + 8x + 15
100

(x - 3) (x + 3)

x^2 - 9

100
(x + 2)^2
x^2 + 4x + 4
100
(x - 4) (x + 4)
x^2 - 16
100
(3x + 4) (4x - 6)
12x^2 - 2x - 24
200
(x - 6) (x + 3)
x^2 - 3x - 18
200

(x + 4) (x - 4)

x^2  - 16

200
(x + 5)^2
x^2 + 10x + 25
200

(9x + 1) (x - 9)

9x^2 - 80x -9

200

(3x - 5)^2

9x^2 - 30x + 25

300
(y + 8) (y + 2)
y^2 + 10y + 16
300
(2x - 2) (x - 6)
2x^2 - 14x + 12
300
(x + 8)^2
x^2 + 16x + 64
300
(x + 1)(x - 1)
x^2 - 1
300

(x + 2) (x^2 + 3x + 5)

x^3 + 5x^2 + 11x + 10

400

(x + 6) (x + 7)

x^2 + 13x + 42

400
(3x - 1) (3x - 5)
9x^2 - 18x + 5
400
(x - 3)^2
x^2 - 6x + 9
400

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

10x^2 +19x -10

400

(3x2 + 7) 2

9x4 + 42x2 +49

500

(x + 1) (x + 2)

x^2 + 3x + 2

500

(6x - 2) (6x +2)

36x^2 - 4

500
(x - 1)^2
x^2 - 2x + 1
500

(11x + 6) (11x - 6)

121x^2 - 36

500

(4x3 - y)2 

16x6 - 8x3y + y2