1
You visited us
1
times! Enjoying our articles?
Unlock Full Access!
Byju's Answer
Standard XII
Mathematics
Geometric Mean
If α and ...
Question
If
α
and
β
are roots of the quadratic equation
x
2
+
2
x
+
2
=
0.
Then
α
15
+
β
15
=
Open in App
Solution
x
2
+
2
x
+
2
=
0
Here,
a
=
1
,
b
=
2
,
,
c
=
2
From quadratic formula,
x
=
−
2
±
√
2
2
−
4
×
2
×
1
2
×
1
⇒
x
=
−
2
±
2
i
2
=
−
1
±
i
Therefore,
α
=
−
1
+
i
⇒
α
2
=
(
−
1
+
i
)
2
=
−
2
i
β
=
−
1
−
i
⇒
β
2
=
(
−
1
−
i
)
2
=
2
i
Now,
α
15
+
β
15
=
(
α
2
)
7
⋅
α
+
(
β
2
)
7
⋅
β
=
(
−
2
i
)
7
(
−
1
+
i
)
+
(
2
i
)
7
(
−
1
−
i
)
=
(
−
2
)
7
(
−
i
)
(
−
1
+
i
)
+
2
7
(
−
i
)
(
−
1
−
i
)
=
2
7
i
(
−
1
+
i
)
+
2
7
i
(
1
+
i
)
=
2
7
i
(
−
1
+
i
+
1
+
i
)
=
2
7
i
⋅
2
i
=
2
8
⋅
(
−
1
)
=
−
256
Suggest Corrections
0
Similar questions
Q.
Given equation
x
2
+
2
x
+
2
=
0
,
α
,
β
are the roots of the equation then
α
15
+
β
15
Q.
x
2
+
2
x
+
2
=
0
has the roots as
α
and
β
then find
α
15
+
β
15
=
?
Q.
Let
α
and
β
be two roots of the equation
x
2
+
2
x
+
2
=
0
, then
α
15
+
β
15
is equal to
Q.
x
2
+
2
x
+
2
has
2
roots
(
α
,
β
)
then
α
15
+
β
15
=
?
Q.
α
,
β
are the solutions of
x
2
+
2
x
+
2
=
0
then
α
15
+
β
15
is
View More
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
Related Videos
Geometric Progression
MATHEMATICS
Watch in App
Explore more
Geometric Mean
Standard XII Mathematics
Join BYJU'S Learning Program
Grade/Exam
1st Grade
2nd Grade
3rd Grade
4th Grade
5th Grade
6th grade
7th grade
8th Grade
9th Grade
10th Grade
11th Grade
12th Grade
Submit
AI Tutor
Textbooks
Question Papers
Install app