Question

Brady said that the expression 2.6x - (1.3x - 4.5) is equivalent to 1.3x - 4.5. is he correct? If not, explain his erro .

Answer 1

The sign was incorrect it have to be 1.3x+4.5

Answer 2

No. His mistake stems from opening the bracket and knowing that - × - = +.

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 - × - = + .