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13-6.
  1. Factor each of the following expressions. Homework Help ✎

    1. x2 − 4

    2. y2 − 81

    3. 1 − x2

    4. 1 − sin2(x)

Remember that a difference of two squares has a special factoring pattern.
a2b2 = (ab)(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.