solve by completing the square method x square - 2 x + 7 = 0
Answers
Answered by
6
Step-by-step explanation:
Move the constant term to the right side of the equation, then add whatever quantity is necessary to both sides so the left side is a square
x
2
+
2
x
−
7
=
0
x
2
+
2
x
=
7
If the first two terms of
(
x
+
a
)
2
=
x
2
+
2
a
x
+
a
2
are
x
2
and
2
x
then
a
=
1
x
2
+
2
x
+
1
=
7
+
1
(
x
+
1
)
2
=
8
x
+
1
=
±
√
8
x
=
−
1
±
2
√
2
Answered by
0
x
2
+
2
x
−
7
=
0
x
2
+
2
x
=
7
If the first two terms of
(
x
+
a
)
2
=
x
2
+
2
a
x
+
a
2
are
x
2
and
2
x
then
a
=
1
x
2
+
2
x
+
1
=
7
+
1
(
x
+
1
)
2
=
8
x
+
1
=
±
√
8
x
=
−
1
±
2
√
2
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