Question

Resolva: A)X^2-9x-10=0

Answer 1

A=1
B=-9
C=-10
delta = b*2-4.a.c
delta = 81-4.1.(-10)
delta =121

achando as raizes:
-b+-raiz do delta/ 2a
9+-11/2
9+11/2= 10
9-11/2=-1

X é igual a 10 e -1