Question

\(\left(x+3\right)^2-\left(x-2\right).\left(x+2\right)\)

thực hiện phép tính

Answer 1

\(=x^2+6x+9-x^2+4\)

=\(6x+13\)

Answer 2

\(=x^3+9x^2+27x+27-\left(x^2-4\right)\)

\(=x^3+9x^2+27x+27-x^2+4\)

\(=x^3+9x^2-x^2+27x+4+27\)

\(=x^3+8x^2+27x+31\)

Answer 3

\(=x^2+6x+9-\left(x^2-4\right)\)

\(=x^2+6x+9-x^2+4\)

\(=x^2-x^2+6x+9+4\)

\(=6x+13\)

Answer 4

=\(=x^2+6x+9-x^2+4\)

\(=6x+13\)

Answer 5

   \((x+3)^2 - (x-2).(x+2)\)

= \(x^2 +6x +9\) - ( \(x^2 -4\) )

=\(x^2 +6x +9\) - \(x^2 +4\)

=6x + 13