Question

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.

Answer 1

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.