Question

 qual  o  resultado de  5x²-15=0

Answer 1

A=5
B=-15
C=0

Δ=b²-4ac
Δ=(-15)²-4.5.0
Δ=225-0
Δ=225

X=-b±√Δ
2a

X=-(-15)±√225
2.5

X= 15±15
10

X¹=15+15 =30 =3
10 10


X²=15-15 = 0 =0
10 10

Answer 2

5x² - 15 = 0

5x²= 0 + 15

5x²= 15

x²= 15/5

x²= 3

x= ± √3

S= ( √3 ; - √3)