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18 August, 10:43

5. Andre is solving the equation 4 (x + 3) = 7. He says, "I can subtract from each side to get

4x = 1 and then divide by 4 to get x = " Kiran says, "I think you made a mistake."

a. How can Kiran know for sure that Andre's solution is incorrect?

b. Describe Andre's error and explain how to correct his work.

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Answers (1)
  1. 18 August, 12:40
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    4 (x+3) = 7

    The mistake is with his final answer, he wrote down 4x=1.

    When you do 4 (x) 4 (3), the answer is completely different from what Andre said. He did wrong calculations.

    4x3=12

    7-12 = - 5

    Which means it should be 4x=-5 as the final answer.
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Home » Mathematics » 5. Andre is solving the equation 4 (x + 3) = 7. He says, "I can subtract from each side to get 4x = 1 and then divide by 4 to get x = " Kiran says, "I think you made a mistake." a. How can Kiran know for sure that Andre's solution is incorrect? b.
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