Math
posted by Ron .
For i = the square root of 1, if 3i (2 + 5i) = x + 6i, then x = ?
A. –15
B. 5
C. 5i
D. 15i
E. 27i

we will be happy to critique your thinking.

Simplify the left hand side (LHS) from
3i(2+5i)
= 6i + 15i^{2}
= 6i  15
Equate to the RHS and solve for x.