Question: 3) Which of the following is the correct factor of x² - 49
Answer:
a) (x + 7) (x + 7)
b) (x + 7) (x - 7)
c) (x - 7) (x-7)
d) x(x + 7)(x-7)
Solution:
a)
(x+7) (x+7)=0
x²+7x+7x+49=0
x²+14x+49=0
b) (x + 7) (x - 7)=0
x²-7x+7x-49=0
x²-49=0
c)
(x - 7) (x-7)
x²-7x-7x+49=0
x²-14x+49=0
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