Faktorkanlah

1.) 2x^2 + 13x – 7 =
2x^2 + 14x – x – 7 =
(2x^2 + 14x) – (x + 7) =
2x (x + 7) – 1 (x – 7) =
(2x – 1) (x – 7)

2.) 12y^2 – 17y – 5 =
12y^2 – 20y + 3y – 5 =
(12y^2 – 20y) + (3y – 5) =
4y (3y – 5) + 1 (3y – 5) =
(4y + 1) (3y – 5)

3.) 3x^2 – 7x – 6 =
3x^2 – 9x + 2x – 6 =
(3x^2 – 9x) + (2x – 6) =
3x (x – 3) + 2 (x – 3) =
(3x + 2) (x – 3)

4.) 6x^2 – x – 5 =
6x^2 – 6x + 5x – 5 =
(6x^2 – 6x) + (5x – 5) =
6x (x – 1) + 5 (x – 1) =
(6x + 5) (x – 1)

5.) 3x^2 + 11x + 6 =
3x^2 + 9x + 2x + 6 =
(3x^2 + 9x) + (2x + 6) =
3x (x + 3) + 2 (x + 3) =
(3x + 2) (x + 3)