Sophia's expression is wrong because it isn't equivalent.
Ursula's expression is wrong because it isn't equivalent.
An equivalent expression is : 6 - 2 + 4x
Using the Parameters given ;
- Original expression = 6 - (2 - 4x)
We can simplify the expression as ;
6 - (2 - 4x)
open the bracket by multiplying the values in bracket by -1
6 - 2 + 4x
Hence, Sophia's expression is wrong
Examining Ursula's expression :
6 - (-2x)
6 + 2x (Wrong expression)