Madeline was completing the square, and her work is shown below. Identify the line where she made her mistake.
f(x) = 3x2 + 6x − 7
Line 1: f(x) = 3(x2 + 2x) − 7
Line 2: f(x) = 3(x2 + 2x + 1) − 7 − 1
Line 3: f(x) = 3(x + 1)2 − 8
Line 1
Line 2
Line 3
She did not make any mistakes

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I think line 1 because it should be 3x on both sides not 2. but u should get a second opinion

Line 1 looks ok :)
Madeline factored a 3 out of each of the first two terms.

what do u think

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