Question

13-2×-15ײ=0 equação

Answer 1

13-2x-15x²=0
a=-15, b=-2, c=13

∆=b²-4.a.c
∆=(-2)²-4.(-15).13
∆=4+780
∆=784

x=-b±√∆/2.a

x'=2+28/2.(-15)
x'=30/-30 .(-1)
x'=-30/30
x'=-1


x''=2-28/2.(-15)
x''=-26/-30 .(-1)
x''=26/30
x''=13/15

Answer 2

13-2x-15x²=0

Δ=b²-4ac
Δ= -2²-4*-15*13
Δ= 4+780
Δ=784   √Δ=28

$x1= \frac{2+28}{2*-15}= \frac{30}{-30}= -1$

$x2= \frac{2-28}{2*-15}= \frac{-26}{-30}= \frac{13}{15}$

$S=(-1; \frac{13}{15} )$

Bons Estudos!!