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Q.

How do you factor x2 + 7x – 60?

Class:  9

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a

x = 5 and x = –12

b

x = –5 and x = –12

c

x = 5 and x = +12

d

x = –6 and x = –6 

answer is A.

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Detailed Solution

x2 +7x – 60 [Pry middle terms]
x2 + 12x – 5x – 60
x(x + 12) – 5(x + 12)
(x – 5)  (x + 12)
x = 5  x = –12

 
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