1) 6[tex]a^{5}[/tex] - 4[tex]a^{4}[/tex] - 16[tex]a^{8}[/tex] = 2[tex]a^{4}[/tex]*(3a - 2 - 8[tex]a^{4}[/tex])
2) a² + 5b - 5a - ab = (a² - ab) - (5a - 5b) = a*(a-b) - 5*(a-b) = (a-b)*(a-5)
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1) 6[tex]a^{5}[/tex] - 4[tex]a^{4}[/tex] - 16[tex]a^{8}[/tex] = 2[tex]a^{4}[/tex]*(3a - 2 - 8[tex]a^{4}[/tex])
2) a² + 5b - 5a - ab = (a² - ab) - (5a - 5b) = a*(a-b) - 5*(a-b) = (a-b)*(a-5)