Multiply the binomials.
(
b
+
1
)
(
b
−
1
)
\displaystyle {\left({b}+{1}\right)}{\left({b}-{1}\right)}
(
b
+
1
)
(
b
−
1
)
b
2
−
1
\displaystyle {b}^{{2}}-{1}
b
2
−
1
b
2
−
1
x
−
1
\displaystyle {b}^{{2}}-{1}{x}-{1}
b
2
−
1
x
−
1
b
2
+
1
\displaystyle {b}^{{2}}+{1}
b
2
+
1
b
2
+
1
x
−
1
\displaystyle {b}^{{2}}+{1}{x}-{1}
b
2
+
1
x
−
1
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