Solve the following quadratic equations by factoring.
Pa answer naman po ASAP.

Answer:
1. x² + 10x + 21 = 0
(x + 3) (x + 7) = 0
x + 3 = 0 x + 7 = 0
x = -3 x = -7
2. p² - 6p + 9 = 0
(p - 3) (p - 3) = 0
p - 3 = 0 p - 3 = 0
p = 3 p = 3
3. x² + 5x + 4 = 0
(x + 4) (x + 1) = 0
x + 4 = 0 x + 1 = 0
x = -4 x = -1