Question

9×(2n²+2n-5 n-10)=0​

Answer 1

9(2n²-3n-10)=0

2n²-3n-10 = 0

S = -b/a , 3/2

P = c/a = -10/2 = -5

S =  5/2 - 2/2    =  3/2

P = 5/2 . (-2/2)  =   -5

então

x' = 5/2

x'' = -2/2 = -1

Espero ter ajudado ;)