Yes, Heather is correct. The expressions are not equivalent
<em><u>Solution:</u></em>
Given that,
Heather says, the following expressions are not equivalent

Because one expression has a term that is subtracted and the other does not
<em><u>Combine the like terms in first expression:</u></em>

<em><u>Let us first expand the second expression</u></em>
By distributive property
a(b + c) = ab + bc
Therefore,

<em><u>Thus the two expressions are:</u></em>

Yes both the expressions are not equivalent
Because, in first expression 2x is added to 8
But in second expression, 8 is subtracted from 2x
Thus heather is correct