Brainliest rewarded to correct answer 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.

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.

not enough information

step-by-step explanation:

we cannot know this, because the other students could have handed out 10 flyers, or they could have handed out 100. one way, the mean would go up, and another way, the mean would go down.

well we know there are 4 clubs in 52 cards so it’s replaced so it should be 3/51

step-by-step explanation: