Mickey simplified the given expression. He then checked his work by substituting 4 for x He noticed his two values were not equal. What was Mickey’s error when simplifying? Mickey's Work Expression Simplified Expression 2 x squared minus 4 x minus 9 minus x squared plus 2 x plus 3 x squared minus 6 x minus 6
Answer
A
Mickey should have added 2 and 1 when combining the x squared terms.
B
Mickey should have added negative 4 and 2 when combining the coefficients of the x terms.
C
Mickey should have added 9 and 3 when combining the constant terms.
D
Mickey should have added negative 4 and negative 1 when combining the x terms.