x4/2 - x2- 1/ 3 =7
x^4/2 - x² - 1/3 = 7
mmc = 6
3x^4 - 6x² - 2 = 42
3x^4 - 6x² - 44 = 0
y = x²
3y² - 6y - 44 = 0
d² = 36 + 12*44 = 564 = 4*141
d = 2√141
y1 = (6 + 2√141)/6 = (3 + √141)/3
y2 = (6 - 2√141)/6 = (3 - √141)/3 não serve
x1 = -√[(3 + √141)/3]
x2 = +√[(3 + √141)/3]
pronto
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Verified answer
x^4/2 - x² - 1/3 = 7
mmc = 6
3x^4 - 6x² - 2 = 42
3x^4 - 6x² - 44 = 0
y = x²
3y² - 6y - 44 = 0
d² = 36 + 12*44 = 564 = 4*141
d = 2√141
y1 = (6 + 2√141)/6 = (3 + √141)/3
y2 = (6 - 2√141)/6 = (3 - √141)/3 não serve
x1 = -√[(3 + √141)/3]
x2 = +√[(3 + √141)/3]
pronto