Question

PRECISO DE AJUDA PLEASE

${x}^{4} - 8 {x}^{2} - 9$
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Answer 1

x⁴ - 8x² - 9 = 0 => b/c= -8/-9 = -9+1/-9•+1

(x² -9). (x² +1) = 0

x= ±3✓..x= { }