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3) Which of the following is the correct factor of x2 - 49
a) (x + 7) (x + 7)
b) (x + 7) (x - 7)
c) (x - 7)(x-7)
d) x(x + 7)(x-7)​


Sagot :

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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