a)
4 - 9x^2 = 0
(2+3x)*(2-3x) = 0
2+3x = 0
3x = -2
x = -2/3
2-3x = 0
-3x = -2
x = 2/3
x = -2/3 v x = 2/3
b)
-9x^2 + 4 = 0
a = -9, b= 0 , c = 4
D = b^2 - 4ac = 0 - 4*(-9) *4 = 36
VD = 6
x1 = (-b+VD)/2a = (0+6)/(-18) = -2/3
x2 = (-b-VD)/2a = (0-6)/(-18) = 2/3
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a)
4 - 9x^2 = 0
(2+3x)*(2-3x) = 0
2+3x = 0
3x = -2
x = -2/3
2-3x = 0
-3x = -2
x = 2/3
x = -2/3 v x = 2/3
b)
4 - 9x^2 = 0
-9x^2 + 4 = 0
a = -9, b= 0 , c = 4
D = b^2 - 4ac = 0 - 4*(-9) *4 = 36
VD = 6
x1 = (-b+VD)/2a = (0+6)/(-18) = -2/3
x2 = (-b-VD)/2a = (0-6)/(-18) = 2/3
x = -2/3 v x = 2/3