(
a
+
b
)
⋅
(
a
−
b
)
=
\displaystyle {\left({a}+{b}\right)}\cdot{\left({a}-{b}\right)}=
(
a
+
b
)
⋅
(
a
−
b
)
=
a
2
+
b
2
\displaystyle {a}^{{2}}+{b}^{{2}}
a
2
+
b
2
a
2
+
2
a
b
+
b
2
\displaystyle {a}^{{2}}+{2}{a}{b}+{b}^{{2}}
a
2
+
2
a
b
+
b
2
a
2
−
b
2
\displaystyle {a}^{{2}}-{b}^{{2}}
a
2
−
b
2
a
2
−
2
a
b
+
b
2
\displaystyle {a}^{{2}}-{2}{a}{b}+{b}^{{2}}
a
2
−
2
a
b
+
b
2
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