Question

find the co - efficient of a² in ( a-1 )( a²+ 1 )

Answer 1

the coefficient will be -1

Answer 2

$(a - 1)( {a}^{2} + 1) = {a}^{3} - {a}^{2} + a - 1 \\ so \: the \: coefficient \: of \: {a}^{2} is \: -1$