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Mathematics
Problem
If
x
2
+
b
x
+
c
x^2 + bx + c
x
2
+
b
x
+
c
can be written as
(
x
+
r
)
(
x
+
s
)
(x + r)(x + s)
(
x
+
r
)
(
x
+
s
)
, which of the following equalities is always true? a)
r
−
s
=
b
r-s=b
r
−
s
=
b
b)
r
s
=
b
rs=b
r
s
=
b
c)
r
+
s
=
b
r+s=b
r
+
s
=
b
d)
r
+
s
=
c
r+s=c
r
+
s
=
c
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