9th Math factorisation 2 (SMT)

​Always multiply a and c.

​2 * 12 = 24

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​Then find 2 numbers that their product is 24. (start using 2, then 3 ...)

​2x12, then 3x8, then 4x6, nothing with 5, 6 already used, ....

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​Use the negative sign accordingly. 24 is positive, both have to be either positive or negative.

​ No combination using 2 and 12.

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​ +3 and +8 = +11 (does not match b = -11)

​ -3 and -8 = -11 (it matches!)

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​no need to combine 4 and 6.

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​Then we apply the common factor every two terms...

​To factorise expressions where a ≠ 1. (SMT)

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​a. Look for 2 numbers to get a*c.

​b. If 'b' is positive, means that both are either positive or negative.

​c. Apply common factor every 2 terms.

​d. Apply common factor at the end.