Odpowiedź:
[tex]x^8 - 4 x^4 - 24 = 0[/tex]
t = [tex]x^4[/tex] ≥ 0
t² - 4 t - 24 = 0
Δ = ( - 4)² - 4*1*( - 24) = 16 + 96 = 112 = 16*7
√Δ = 4√7
t = [tex]\frac{4 - 4\sqrt{7} }{2*1} = 2 - 2\sqrt{7}[/tex] < 0 lub t = 2 + 2√7
więc
[tex]x^4 = 2 + 2\sqrt{7}[/tex]
x = [tex]\sqrt[4]{2 + 2\sqrt{7} }[/tex]
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Odpowiedź:
[tex]x^8 - 4 x^4 - 24 = 0[/tex]
t = [tex]x^4[/tex] ≥ 0
t² - 4 t - 24 = 0
Δ = ( - 4)² - 4*1*( - 24) = 16 + 96 = 112 = 16*7
√Δ = 4√7
t = [tex]\frac{4 - 4\sqrt{7} }{2*1} = 2 - 2\sqrt{7}[/tex] < 0 lub t = 2 + 2√7
więc
[tex]x^4 = 2 + 2\sqrt{7}[/tex]
x = [tex]\sqrt[4]{2 + 2\sqrt{7} }[/tex]
===================
Szczegółowe wyjaśnienie: