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Mathematics
Mathematics
Problem
Assuming
a
a
a
and
b
b
b
are real constants, expand
y
=
(
x
−
a
−
b
)
(
x
−
a
+
b
)
(
x
+
a
−
b
)
(
x
+
a
+
b
)
y = (x - a - b)(x - a + b)(x + a - b)(x + a + b)
y
=
(
x
−
a
−
b
)
(
x
−
a
+
b
)
(
x
+
a
−
b
)
(
x
+
a
+
b
)
and hence determine the least value of
y
y
y
.
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