What is the factored form of a2 – 121?

answer choices available:
a. (a - 121)(a-1)
b. (a - 11)(a + 11)
c. (a + 11)(a + 11)
d. (a - 121)(a + 1)

as always, for your .

option: d is correct

step-by-step explanation:

step-by-step explanation:

this can be solved first with pythagorean theorem, which tells us to square both legs of the triangle and sum it. this will be equal to the square of the hypotenuse.

the hypotenuse is the side "opposite" the 90 degree angle, which is x.

so we can write using pythagorean theorem,

simplifying:

to further simplify this radical, we need to use the property  

thus