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bcalle

x^2 + 5x + 4
list the factors of 4     14 and 22
which of the factors add up to 5        1 + 4 = 5
(x + 1)(x + 4)

x^2 - 7x + 10
list the factors of 10     110 and 25
which of these factors add up to 7      2 + 5 = 7
since it is -7 it will be -2 + -5 = -7
(x - 2)(x -  5)

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