" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
x² + 3x - c = 0
a = 1
b = 3
c = c
p +q = -b/a = -3/1 = -3
pq = c/a = c/1 = c
p² + q² = 21
(p + q)² - 2pq = 21
(-3)² - 2c = 21
9 - 2c = 21
-2c = 12
c = -6