### Home > A2C > Chapter 13 > Lesson 13.1.1 > Problem 13-6

13-6.

Factor each of the following expressions. Homework Help ✎

*x*^{2}− 4*y*^{2}− 811 −

*x*^{2}1 − sin

^{2}(*x*)

Remember that a difference of two squares has a special factoring pattern. *a*^{2} − *b*^{2} = (*a* − *b*)(*a* + *b*)

(*x* + 2)(*x* − 2)

Use the same method as part (a).

This might look different than the expressions in parts (a) and (b), but you can use the same method to factor it.

(1 − *x*)(1 + *x*)

Think of sin^{2}(*x*) as one big variable (like *x*^{2}).

Then use the same method as part (c) to factor it.