Error Analysis
Completing the Square
Robbie solved x² + 12x + 7 = 0 using the completing...
Mathematics, 06.05.2020 08:13 nathang444
Error Analysis
Completing the Square
Robbie solved x² + 12x + 7 = 0 using the completing the
square method. His work is shown below. is his method
correct? If not, explain and correct his error. You must
show and explain your work in order to receive credit!
Your work
Robbie's work
x + 12x = 7
x + 12x + 36 = 7
VOX+6)= 7
X + 6 = 117
Robbie's answer is 6 v7
What mistakes did Robbie make? And solve the equation.
Answers: 3
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