Put the equation
y
=
x
2
+
10
x
+
21
\displaystyle {y}={x}^{{2}}+{10}{x}+{21}
y
=
x
2
+
10
x
+
21
into the form
y
=
(
x
+
h
)
2
+
k
\displaystyle {y}={\left({x}+{h}\right)}^{{2}}+{k}
y
=
(
x
+
h
)
2
+
k
:
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