Question

5°) Resolva as equações.
a) x4 – 16x2 =0
b) 4x4 – 5x2 + 9=0.
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Answer 1

a) ↓

$x4 – 16x2 =0 \\ 4x - 32x = 0 \\ - 28x = 0 \\ x = 0$

b) ↓

$4x4 - 5x2 + 9 = 0 \\ 16x - 10x + 9 = 0 \\ 6x + 9 = 0 \\ 6x = - 9 \\ x = - \frac{3}{2}$

Espero que ajude!

Answer 2

Resposta:

$x^4-16x^2=0=x=4,\:x=-4,\:x=0\\\\\\4x^4-5x^2+9=0=x=\frac{\sqrt{17}}{4}+\frac{\sqrt{7}}{4}i,\:x=-\frac{\sqrt{17}}{4}-\frac{\sqrt{7}}{4}i,\:x=-\frac{\sqrt{17}}{4}+\frac{\sqrt{7}}{4}i,\:x=\frac{\sqrt{17}}{4}-\frac{\sqrt{7}}{4}i$