" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2025 KUDO.TIPS - All rights reserved.
Verified answer
W tegak lurus u dan v, makau x v = w
((u2.v3 - u3.v2), (u3.v1 - u1.v3), (u1,v2 - u2.v1)) = w
((1(-1) - 2(-1)), (2(-1) - a.(-1)), (a(-1) - 1(-1)) = w
w = (1, a - 2, -a + 1)
|w| = 3
akar(1² + (a - 2)² + (-a + 1)²) = 3
1² + (a - 2)² + (-a + 1)² = 9
1 + a² - 4a + 4 + a² - 2a + 1 = 9
2a² - 6a + 6 = 9
2a² - 6a - 3 = 0
a = 2, b = -6, c = -3
Jumlah nilai a yg mungkin
= -b/a
= -(-6)/2
= 3
Jawaban C
Verified answer
------ Jawaban Terlampir ------