Giải các phương trình:
a) $3x^4-22x^2-45=0                          b) (3x^2+2x+4)^2-x^2(x+8)^2=0$
$c) 25x^4- 29x^2+4=0                           d) x^4-(m^2+4)x^2+4m^2=0$
$e) x^4-2(a^2+b^2)x^2 +(a^2-b^2)^2=0$
Đáp số:
a) S ={$\pm 3$}                                                  b) S = {$-2; -\frac{1}{2}; 1; 2 $}
c) S = {$-1; -\frac{2 }{5} ; 1; \frac{2  }{5}$}                    d) S = {$\pm 2; \pm m$}
e) S = {$\pm (a-b);  \pm (a+b)$}.

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