The true statement is that Stephen's factored expression is incorrect
The expression is given as:
[tex]x^2-10x+21[/tex]
Start by expanding the equation
[tex]x^2-10x+21 = x^2-7x - 3x+21[/tex]
Factorize the equation
[tex]x^2-10x+21 = x(x-7) - 3(x-7)[/tex]
Factor out x - 7
[tex]x^2-10x+21 = (x-3)(x-7)[/tex]
The above expression shows that:
Stephen's factored expression is incorrect
Read more about factored expressions at:
https://brainly.com/question/11579257
