Решите уравнение(189-190)Дам 40 баллов.Срочно! 1)[latex] x^{4} -34 x^{2} =225=0[/latex] 2)[latex] x^{4}-20 x^{2} +100=0[/latex] 3)[latex] x^{4}+3 x^{2} -28=0 [/latex] 4)[latex] x^{4}-4 x^{2} -24=0 [/latex]

[latex]1)\; \; x^4-34x^2+225=0\; ,\\\\x^2=17-8=9\; ,\; \; x^2=17+8=25\\\\x_{1,2}=\pm 3\; ,\; x_{3,4}=\pm 5\\\\2)\; \; x^4-20x^2+100=0\; ,\\\\(x^2-10)^2=0\; \; \to \; \; x^2=10\; ,\; \; x_{1,2}=\pm \sqrt{10}\\\\3)\; \; x^4+3x^2-28=0\; ,\\\\x^2=-7\; \; net\; reshenij,\; t.k.\; x^2 \geq 0\\\\x^2=4\; \; \to \; \; x_{1,2}=\pm 2[/latex] [latex]4)\; \; x^4-4x^2-24=0\; ,\\\\D/4=4+24=28\; ,\\\\x^2=2-\frac{}{}\sqrt{28}=2-2\sqrt7\ \textless \ 0\; \; net\; reshenij\\\\x^2=2+2\sqrt7\; \; \to \; \; x_{1,2}=\pm \sqrt{2+2\sqrt7}=\sqrt{2(1+\sqrt7)}[/latex]