Factor each of the following expressions. Homework Help ✎
x2 − 4
y2 − 81
1 − x2
1 − sin2(x)
Remember that a difference of two squares has a special factoring pattern.
a2 − b2 = (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 sin2(x) as one big variable (like x2).
Then use the same method as part (c) to factor it.