Question

Madeline was completing the square and her work is shown below. Identify the line where she made her mistake.

f(x) = 3x^2 + 6x − 7
Line 1: f(x) = 3(x + 2x) − 7
Line 2: f(x) = 3(x + 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

Answer 1

she left off the 3 when she removed the -1 from the parenthesis. Line 2 is where she messed up.

Answer 2

Thank you! Can you verify for me that this is B?
Solve 2x^2 + 12x − 14 = 0 by completing the square.

2(x + 6)^2 = 26; x = −6 + square root 13, x = −6 − square root 13

2(x + 6)^2 = 20; x = −6 + square root 20, x = −6 − square root 20

2(x + 3)^2 = 32; x = 1, x = −7

2(x + 3)^2 = 32; x = 13, x = 19

Answer 3

yep...just give me a sec

Answer 4

its the third choice down.

Answer 5

Thank you

Answer 6

Do you know how I got that?

Answer 7

Let me rephrase...do you WANT to know how I got that or do you know already?