Question

Considere a seguinte função polinomial e assinale o que for correto: p(x) = x^4 - 3x^2 -4

Answer 1

$\displaystyle \sf x^4-3x^2-4 \\\\ x^2=\frac{-(-3)\pm\sqrt{(-3)^2-4\cdot 1\cdot(-4)}}{2\cdot 1 } \\\\\\ x^2=\frac{3\pm\sqrt{9+16}}{2} \to x^2=\frac{3\pm\sqrt{25}}{2} \to x^2=\frac{3\pm5}{2} \\\\\\ x^2 = \frac{3+5}{2} \\\\\ x^2=4 \\\\ \boxed{\sf x=2 \ \ ;\ \ x=-2 }\\\\\\\ x^2=\frac{3-5}{2} \\\\\ x^2=-1 \to x=\pm\sqrt{-1}\\\\\ \boxed{\sf x= i \ \ ; \ \ x=-i }$

02 e 04 estão corretas.