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Mickey simplified the expression below. 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?

Expression: 2x^2 - 4x - 9 - x^2 + 2x + 3

Simplified expression: x^2 - 6x - 6

ANSWER CHOICES:
Mickey should have added –4 and 2 when combining the coefficients of the x terms.
Mickey should have added 2 and 1 when combining the x^2 terms.
Mickey should have added 9 and 3 when combining the constant terms.
Mickey should have added –4 and –1 when combining the x terms.

Respuesta :

The answer is a, hope this helped

Answer:

Mickey should have added –4 and 2 when combining the coefficients of the x terms.

Step-by-step explanation:

Mickey simplified the expression below. He then checked his work by substituting 4 for x. He noticed his two values were not equal

Expression: 2x^2 - 4x - 9 - x^2 + 2x + 3

Simplified expression: x^2 - 6x - 6

2x^2- x^2 - 4x + 2x - 9  + 3

x^2 -2x -6

-4x +2x = -2x (both have different sign so we subtract)

Mickey should have added –4 and 2 when combining the coefficients of the x terms.