lukasconway1730 lukasconway1730

14-02-2018
Mathematics

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What are the factors of the polynomial below?

x2 + 7x - 18

A. (7x + 11)(x - 1)
B. (x + 2)(9x - 2)
C. (x + 9)(x - 2)
D. (7x + 9)(x - 2)

Respuesta :

14-02-2018

It is c because you can do a cross then put the 7 as the sum and -18 as the product and then you see what can be multiplied to get you -18 and at the same time get you 7 when you add both of them together. Which is -2 and 9.

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