Question

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Answer 1

1) x^6-x^4-x^2+1= x^4(x^2-1)-(x^2-1)=(x^2-1)(x^4-1)

2) (5-a+1)^2=(6-a)^2= 36-12a+a^2

Answer 2

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${x}^{6} - {x}^{4} - {x}^{2} + 1 = {x}^{4} ( {x}^{2} - 1) - {(x}^{2} - 1) = {(x}^{2} - 1)( {x}^{4} - 1)$
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$(5 - a + 1) ^{2} = {(6 - a)}^{2} = 36 - 12a + {a}^{2}$