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Mathematics

Grade10

Easy

Question

Find out the common factor of x²+ 7x – 18 and x²- 7x – 18.

x + 9
x – 2
x – 9
No common factor

The correct answer is: No common factor

x²+ 7x – 18
¶Factors of -18 are 9 and -2.
¶9 + (-2) = 7
¶(x + 9) (x – 2)
¶x²- 7x – 18
¶Factors of -18 are -9 and 2.
¶-9 + 2 = -7
¶(x – 9) (x + 2)
¶No common factor.
¶

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