Tolong dibantu please. Saya ga ngerti

jawab

3x² - x - 5= 0
a = 3
b = -1
c = - 5
x1 + x2 = -b/a = -(-1)/(3) = 1/3
x1 x2 = c/a = -5/3 = - 5/3

x1²+ x2²  + 2 x1 x2 = (x1 + x2)²
= ( 1/3)²
=  1/9