persamaan kuadrat 2x ^2 +x+6=0. mempunyai akar x1 dan x2. nilai x1^2 + x2^2 =
Matematika
khairamutia1
Pertanyaan
persamaan kuadrat 2x ^2 +x+6=0. mempunyai akar x1 dan x2. nilai x1^2 + x2^2 =
1 Jawaban
-
1. Jawaban dharmawan12
2x^2 +x +6 = 0
x1 + x2 = -1/2
x1.x2 = 6/2 =3
(x1 + x2)^2 = x1^2 + x2^2 +2x1.x2
x1^2 + x2^2 = (x1 + x2)^2-2x1.x2
= (-1/2)^2 - 2(3)
= 1/4 -6
= -5 3/4