If, a+b+c=0, 4a+2b+c=0, a+2b+4c=0, find a^2013+b^2013+c^2013. [^ denotes to the power of]
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a+b+c=0, 4a+2b+c=0, a+2b+4c=0 (4a+2b+c)-(a+b+c)=3a+b=0 (a+2b+4c)-(a+b+c)=b+3c=0 (4a+2b+c)-(a+2b+4c)=3a-3c=0 a=c from 3a-3c=0 b=-3a from 3a+b=0 a+a-3a=0 -a=0, a=0 or c+c-3c=0, c=0 so a=0, b=0, c=0
a
+
b
+
c
=
0
→
E
q
.
1
4
a
+
2
b
+
c
=
0
→
E
q
.
2
a
+
2
b
+
4
c
=
0
→
E
q
.
3
Subtracting
E
q
.
3
and
E
q
.
2
, we get,
3
a
−
3
c
=
0
⇒
a
=
c
→
E
q
.
4
Now, using
E
q
.
4
in
E
q
.
2
, we get,
4
c
+
2
b
+
c
=
0
⇒
b
=
2
(
−
5
c
)
So,
a
:
b
:
c
=
1
:
2
(
−
5
)
:
1
So,
a
=
x
,
b
=
2
(
−
5
x
)
and
c
=
x
.
Putting these values in
E
q
.
1
,
x
+
2
(
−
5
x
)
+
x
=
0
2
x
+
2
(
−
5
x
)
=
0
⇒
2
(
−
x
)
=
0
⇒
x
=
0
So,
a
=
x
=
0
,
b
=
2
(
−
5
x
)
=
0
&
c
=
x
=
0
.
Hence,
a
2
0
1
3
+
b
2
0
1
3
+
c
2
0
1
3
=
0
.
solve for the variables, a = b = c = 0, so the answer is 0
from eq 2 and eq3 a=c b=-3c .. so a:b:c=1:-3:1 but hold on a+b+c=0 , so a=b=c=0 ..hence the answer
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The determinant of the coefficient matrix of the LHS is non-zero (-6). The column vector of the RHS is all zeroes. To solve for a, b and c, we replace a column in the coefficient matrix with the column vector from the RHS. The determinant of a matrix with any column all zero is also zero. Therefore, a = b = c = 0/(-6) = 0. Zero to any non-zero power is also 0, so the answer is 0.