" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
1. x1 - x2 = √D / a
√3² - 4(3a - 1) / 1 = 5
√9 - 12a + 4 = 5
√-12a + 13 = 5
√-12a + 13 = √25
-12a + 13 = 25
-12a = 12
a = -1
2. 2x1 - x2 = 7
x1 + x2 = m
2x1 + 2x2 = 2m
-3x2 = 7 - 2m
x2 = -7 + 2m / 3
3x1 = 7 + m
x1 = 7 + m / 3
x1x2 = 2m - 7
-49 + 7m + 2m² / 9 = 2m - 7
-49 + 7m + 2m² = 18m - 63
2m² - 11m + 14 = 0
(2m - 7) (m - 2) = 0
m = 7/2,2
maka nilai m adalah
m = 7/2 atau m = 2