Question

(a ^ 2 - a - 1) ^ 2 (expand)​

Answer 1

Answer:

${a}^{4} + {a}^{2} + 1 - 2 {a}^{3} - 2 {a}^{2} + 2a$

Step-by-step explanation:

Use the formula :

${(a \: + b \: + c)}^{2} = {a}^{2} \: + {b}^{2} + {c}^{2} + 2ab \: + 2bc \: + 2ca$

$( { {a}^{2} \: - \: a \: - 1) }^{2} = {a}^{4} + {a}^{2} + 1 - 2 {a}^{3} - 2 {a}^{2} + 2a$