Homework Help: Math

Posted by Ron on Wednesday, June 24, 2009 at 7:59pm.

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

Math - bobpursley, Wednesday, June 24, 2009 at 8:42pm
we will be happy to critique your thinking.
Math - MathMate, Wednesday, June 24, 2009 at 8:43pm
Simplify the left hand side (LHS) from
3i(2+5i)
= 6i + 15i²
= 6i - 15
Equate to the RHS and solve for x.

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