smithlove smithlove

17-10-2018
Mathematics

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Which of the following equations has infinitely many real solutions? A. 3(x - 7) = 3x + 21 B. 3x + 1 = 3x - 1 C. 3x + 1 = x - 1 D. 3(x - 7) = 3x - 21

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choixongdong choixongdong

17-10-2018

Answer is D. 3(x - 7) = 3x - 21

because

3(x - 7) = 3x - 21

Distributive property

3x - 21 = 3x - 21

0 = 0

Infinitely many real solutions

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