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Mathematics
Mathematics
Problem
If the projection of vector
x
i
^
−
j
^
+
k
^
x\hat{i} - \hat{j} + \hat{k}
x
i
^
−
j
^
+
k
^
on vector
2
i
^
−
j
^
+
5
k
^
2\hat{i} - \hat{j} + 5\hat{k}
2
i
^
−
j
^
+
5
k
^
is
1
30
\frac{1}{\sqrt{30}}
30
1
, then find the value of
x
x
x
.
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