Answer:
No. His mistake stems from opening the bracket and knowing that - × - = +.
Step-by-step explanation:
This is an algebraic expression. In such systems, the following notations are key;
- × - = +
+ × - = -
- × + = -
+ × + = +
Considering the expression,
2.6x - (1.3x - 4.5)
= 2.6x - 1.3x + 4.5
= 1.3x + 4.5
This is not equivalent to 1.3x - 4.5 hence he is wrong. His mistake stems from opening the bracket and knowing that - × - = + .
