For i^2 = -1, if 3i (2 + 5i) = x + 6i, then x =?
- 5i
- 15i
- -15
- None of these
Explanation
The calculation confirms that:
3i(2 + 5i) = 6i + 15i^2
= 6i - 15
Comparing this to x + 6i:
x = -15
The calculation confirms that:
3i(2 + 5i) = 6i + 15i^2
= 6i - 15
Comparing this to x + 6i:
x = -15
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