Apply the "ac" method

From the trinomial, ,

a = 5

b = - 4

c = - 28



ac = 5(- 28), or - 140

As "ac" = - 140, and b = - 4, we need to determine which 2 numbers have a product of - 140, and sum to b, or - 4



These 2 numbers are: + 10 and - 14

 ----- Replacing - 4a with (10a - 14a)

 ------ Factoring each pair of expressions



You can do the check!! 



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