[tex]1)\\\\x^6+7x^5-8x^4=0\\\\x^4(x^2+7x-8)=0\\\\x^4(x^2+8x-x-8)=0\\\\x^4(x(x+8)-(x+8))=0\\\\x^4(x+8)(x-1)=0\\\\x^4=0\ \ \ \ \vee\ \ \ \ x+8=0\ \ \ \ \vee\ \ \ \ x-1=0\\\\x=0\ \ \ \ \ \ \vee\ \ \ \ x=-8\ \ \ \ \ \ \vee\ \ \ \ x=1\\\\\\2)\\\\W(x)=3x^3-2x^2-6x+4=x^2(3x-2)-2(3x-2)=(3x-2)(x^2-2)=\\\\=(3x-2)(x-\sqrt{2})(x+\sqrt{2})[/tex]
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[tex]1)\\\\x^6+7x^5-8x^4=0\\\\x^4(x^2+7x-8)=0\\\\x^4(x^2+8x-x-8)=0\\\\x^4(x(x+8)-(x+8))=0\\\\x^4(x+8)(x-1)=0\\\\x^4=0\ \ \ \ \vee\ \ \ \ x+8=0\ \ \ \ \vee\ \ \ \ x-1=0\\\\x=0\ \ \ \ \ \ \vee\ \ \ \ x=-8\ \ \ \ \ \ \vee\ \ \ \ x=1\\\\\\2)\\\\W(x)=3x^3-2x^2-6x+4=x^2(3x-2)-2(3x-2)=(3x-2)(x^2-2)=\\\\=(3x-2)(x-\sqrt{2})(x+\sqrt{2})[/tex]