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Which of the following represents the equation of
-
2
x
2
+
8
x
y
+
1
=
0
when rotated through
θ
=
45
∘
?
3
(
x
′
)
2
+
2
x
′
y
′
+
5
(
y
′
)
2
+
1
=
0
3
(
x
′
)
2
+
2
x
′
y
′
-
5
(
y
′
)
2
+
1
=
0
3
(
x
′
)
2
-
2
x
′
y
′
-
5
(
y
′
)
2
+
1
=
0
3
(
x
′
)
2
+
2
x
′
y
′
-
5
(
y
′
)
2
-
1
=
0
Box 1:
Select the best answer
3
(
x
′
)
2
+
2
x
′
y
′
-
5
(
y
′
)
2
+
1
=
0
↑
X
MathQuill
Basic
General
Intervals
Inequalities
Functions
Trig
x
x
√
n
√
|
|
(
)
π
∞
DNE
x
√
(
)
π
∞
DNE
(
)
(
]
[
)
[
]
—∞
∞
∪
DNE
<
>
≤
≥
or
All Real Numbers
DNE
log
log
n
ln
n
√
|
|
e
sin
cos
tan
arcsin
arccos
arctan
⟨
⟩
∞
DNE
-∞
∞
∪
DNE
[more..]