Помогите пожалуйста. Алгебра 8 класс. Даю 28 баллов.

Решите уравнения:

[tex]x^{2} +5x=0\\2x^{2} -9x=0\\-x^{2} +8x=0\\3x-x^{2} =0\\x^{2}-9=0\\x^{2} -5=0\\-2x^{2} +50=0\\-3x^{2} +4=0[/tex]
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