Answer:
(x - 2)(x + 2)
Step-by-step explanation:
If this is a difference of squares, it factors like this.
The general rule is x^2 - a^2 factors into sqrt(x^2) +/- sqrt(a^2)
That always produces 2 factors: (x + a)(x - a)
n - 7 = 21, n= 28 should be right bc the difference of 28 and 7 is 21
