Помогите решить номер и прибавлю 20б
Разложить на множители:[tex]1) 3a^{2}-3b^{2} \\2) 6x^{2} -24\\3)x^{3} -9x\\4)b^{4} -625\\5)-3x^{2} -30x-75\\6)63y^{3} -84y^{2} z+28yz^{2} \\7)a^{3}+a^2-9a- 9\\8)a^{2} +2ab+b^{2}-c^{2}[/tex]
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