Write each expression in factored form. If not possible, write "not possible." 1. x² - 144

2. x² + 16

3. 25 - x²

4. 6² - a²

5. 100+ y²

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given