6) Identify the mistake made:
x2 - 4x = -2
x2 - 4x - 2 = 0
4 + V-4*41X-2) = *=V16=8 = 4x2 = **7 = 2 = 16
2(1)
a) No mistake
b) They simplified the square root incorrectly.
c) Plugged in the numbers incorrectly
d) When moving the constant, they did not move it correctly, it should be a positive number.