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If the expression is, x2 + 2x - 15 this has factors of (x + 5)(x - 3). If the expression is, x2 - 2x - 15 then the factors are (x - 5)(x + 3)
7 and 3 - 2x are factors of 21 - 14x
Factorizing is putting expressions into brackets to simplify them. For example 6x3+4x2+2x can be factorized into 2x(3x2+2x+1). When the bracket is multiplied out, it'll give the original expression: (2x*3x2)+(2x*2x)+(2x+1)=6x3+4x2+2x To do this needs a lot of trial and error to get the right combination of numbers and letters in and out of the brackets.
13
12x + 5 - 2x =(12x - 2x) + 5 =10x + 5 =5 (2x + 1)