1 answer:
Answer:
His mistake was he didn't multiply 3(4) when he was opening the parenthesis
Step-by-step explanation:
Correct solution:
12x – 5 = 3(x + 4)
Open parenthesis
12x – 5 = 3x + 12
Collect like terms
12x - 3x = 12 + 5
9x = 17
x = 17/9
x = 9 8/9
Incorrect solution:
12x – 5 = 3(x + 4)
His mistake was he didn't multiply 3(4) when he was opening the parenthesis
12x – 5 = 3x + 4
12x = 3x - 1
9x = -1
r
9x
-
9
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