Ahhhh i need help again. Which two expressions are equivalent? A. 7(3 + x) and 7∙ 3 + 3 ∙ x B. 7 + 3 + x and (7 + 3)

Question

Ahhhh i need help again.
Which two expressions are equivalent?

A. 7(3 + x) and 7∙ 3 + 3 ∙ x
B. 7 + 3 + x and (7 + 3) + x
C. 7 ∙ x ∙ 3 and 7(x + 3)
D. 7 ÷ (3 – x) and 7 ÷ (x – 3)

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MichaelMet 3 years 2021-07-29T16:26:49+00:00 1 Answers 8 views 0

Answers ( )

  1. dangkhoa
    0
    2021-07-29T16:28:42+00:00
    Reply

    Answer:

    B

    Step-by-step explanation:

    A. these simply to 21 + 7x and 21 + 3x

    • this one is incorrect because the 7x and 3x are different

    B. these simplify to 10 + x and 10 + x

    • this is the correct one since they are exactly the same

    C. these simplify to 21x and 7x + 21

    • these two are not the same because one expression has only a number with a variable but the other one has a number with a variable and another number

    D. these simplify to  \frac{7}{3-x}  and  \frac{7}{x-3}

    • in subtraction, the order of the 3 and the x matters, so the equations are not the same
    • example: 6 – 4 = 2 but 4 – 6 = -2

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