Question

I). (a+1)(a-1)(4+1)​

Answer 1

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$(a + 1)(a - 1)(4 + 1)$

$a(a - 1) + 1(a - 1)( 5)$

$( {a}^{2} - a + (a - 1)5$

${a}^{2} - a + 5a - 5$

${a}^{2} + 4a - 5$

${a}^{2} + 5a - a - 5$

$a(a + 5) - 1(a + 5)$

$(a - 1)(a + 5)$

a=1 & a=-5

a=1 & a=-5so,a=(1,-5)

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