Question

escreva a equação 13-2x-15x2=0 e resolva

Answer 1

13-2x-15x²=0
Organizando:
-15x²-2x+13=0
Δ= b²-4.a.c
Δ= 2²-4.(-15).13
Δ= 4-4.(-195)
Δ= 4+780
Δ= 784
X= -b +- √Δ/ 2a
X= -(-2)+-√784/ 30
X'= 2+28/30= 30/30=1
X"= 2-28/30= -26/30= 13/15