1.7 Lösning 2b

\( \, (2 \,+\, 3)\,^2 \, = \, (\,5\,)\,^2 \, = \, 5\,^2 \, = \, 5 \cdot 5 \, = \, 25 \, \)

\( \, 2\,^2 \,+\, 3\,^2 \, = \, 2 \cdot 2 \, \,+\, \, 3 \cdot 3 \, = \, 4 \,+\, 9 \, = \, 13 \, \)

\[ \;\;\, 25 \quad \neq \quad 13 \, \]

\( \; \Downarrow \)

\[ \quad\, (2 \,+\, 3)\,^2 \; \neq \; 2\,^2 \,+\, 3\,^2 \, \]

\( \; \Downarrow \)

  FALSKT