akar akar persamaan kuadrat 6x + 3= 5x^2. nilai 3/10a + 3/10b = sangat diharapkan cara yg lengkap, terima kasih :)

jawab
persamaan kuadrat
6x + 3= 5x²
5x²- 6x - 3 = 0 akar akar nya a dan b
a + b =  -(-6)/5 = 6/5
a b = -3/5

3/(10a) + 3/(10b) = {3(10b ) + 3(10a)}/(100 ab)
= 30(a+b)/ 100(ab)
= 30/100  (a + b)/(ab)
= 3/10 (6/5)/(-3/5)
= 3/10 (-2)
= -6/10
= -3/5