Chapter 8.1, Problem 61HP

To determine

To state: If the solutions for $\left(2x^2-x\right)-\left(3x+3x^2-2\right)$ are correct or not? Explain your reasoning.

Answer to Problem 61HP

None of the solution is correct.

Explanation of Solution

Given:

  

Calculation:

In the solution of Cheyenne when the negative sign is distributed then the sign of all the terms inside the parenthesis should be changed. He has only changed the sign of $3x$ . So, the solution is incorrect.

Now come to the Sebastian solution, he also did the same error. When the negative sign is distributed then he hasn’t changed the sign of $-2$ . So, this solution is also incorrect.

Therefore, none of the solution is correct.