Question

Ayudar porfavor : como resolver esta ecuación con la fórmula
81x²=9

Answer 1

Resolver.

81x² = 9
x² = 9/81
x² = 1/9
x = √1/9    Tiene 2 soluciones
x = 1/3
  o
x = - 1/3

Solucion.
(1/3 , - 1/3)

Con formula.

81x² = 9
81x² - 9 = 0

a = 81
b = 0
c = -9

x = [- b+/- √(b² - 4ac)]/2a

x = [ - 0 +/-√(0 - 4(81)(-9)] (2*81)
x = [+/-√(2916)]/162
x = +/-54 /162
x = +/- 1/3
x1 = 1/3
x 2 = - 1/3

Solucion.
(1/3 , - 1/3)