Question

Jika x_{1} dan x_{2} adalah akar-akar penyelesaian dari persamaan 3x² + x - 10 = 0, maka nilai x_{1} + x_{2} =....

Answer 1

3x² + x - 10 = 0
a = 3
b = 1
c = -10

x1 + x2 = -b/a
= -1/3

==========
Pembuktian :
Faktorkan :
(3x - 5)(x + 2)

3x - 5 = 0
3x = 5
x = 5/3

x + 2 = 0
x = -2

x1 + x2 = 5/3 + (-2)
= 5/3 - 6/3
= -1/3