Answer:
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The true statement is that Stephen's factored expression is incorrect.
Given
The expression is given as:

<h3>What is factorization?</h3>
Factorization involves splitting a function into factors.
Start by expanding the equation

Factorize the equation

Factor out x - 7

Hence, the true statement is that Stephen's factored expression is incorrect.
Read more about factored expressions at:
brainly.com/question/11579257