Monique solves the quadratic equation 22+6x-9=0 using the quadratic formula.
In which step did Monique make an error?
x=
-(6)√6-4(1X-9)
2(1)
Step 1: x-
-6 ±√72
-6±√36+36
2
Step 2: x-
2
Step 3: x-(-6+6√2-6-6√2)
CLEAR
CHECK
Step 1: Monique should subtract 36 underneath the
radical instead of add.
Step 2: Monique must divide -6 by 2 before simplifying
the radical.
Step 3: Monique did not divide by 2 for each of the
resulting numerators.
Monique did not make an error.