Question 671133
Distribute the 3i
3i(2) + 3i(5i) = x + 6i
...
cross(6i) + 15i^2 - cross(6i) = x
...
15i^2 = x
...
x = 15{{{sqrt(-1)^2}}}
x = 15(-1)
{{{highlight_green(x=-15)}}}
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