Question

How do we expand `(A+2)^2`?

Answer 1

`(A+2)^2=A^2+4A+4`

Explanation:

`(A+2)^2`

= `(A+2)(A+2)`

= `A(A+2)+2(A+2)`

= `A×A+A×2+2×A+2×2`

= `A^2+2A+2A+4`

= `A^2+4A+4`