**Factoring Quadratics - Math is Fun**
https://www.mathsisfun.com/algebra/factoring-quadratics.html

Step 1: ac is 6×(−6) = −36, and b is 5. List the positive factors of ac = −36: 1, 2, 3, 4, 6, 9, 12, 18, 36. One of the numbers has to be negative to make −36, so by playing with a few different numbers I find that −4 and 9 work nicely: −4×9 = −36 and −4+9 = 5 . Step 2: Rewrite 5x with −4x and 9x: 6x 2 − 4x + 9x − 6

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