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Mathematics
Problem
The vectors
x
i
+
(
x
+
1
)
j
+
(
x
+
2
)
k
x\mathbf{i} + (x+1)\mathbf{j} + (x+2)\mathbf{k}
x
i
+
(
x
+
1
)
j
+
(
x
+
2
)
k
,
(
x
+
3
)
i
+
(
x
+
4
)
j
+
(
x
+
5
)
k
(x+3)\mathbf{i} + (x+4)\mathbf{j} + (x+5)\mathbf{k}
(
x
+
3
)
i
+
(
x
+
4
)
j
+
(
x
+
5
)
k
and
(
x
+
6
)
i
+
(
x
+
7
)
j
+
(
x
+
8
)
k
(x+6)\mathbf{i} + (x+7)\mathbf{j} + (x+8)\mathbf{k}
(
x
+
6
)
i
+
(
x
+
7
)
j
+
(
x
+
8
)
k
are coplanar if
x
x
x
is equal to a. 1 b. -3 c. 4 d. 0
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