(−3i)(7i) + (5i)(2 + i)
You asked:
Evaluate the expression: \(-\left( 3 i \right) \cdot 7 i + 5 i \left(2 + i\right)\)
MathBot Answer:
Evaluated
\(\displaystyle -\left( 3 i \right) \cdot 7 i + 5 i \left(2 + i\right) = 21 + 5 i \left(2 + i\right) \)
Expanded
\[-\left( 3 i \right) \cdot 7 i + 5 i \left(2 + i\right) = 16 + 10 i\]
Factored
\[-\left( 3 i \right) \cdot 7 i + 5 i \left(2 + i\right) = 16 + 10 i\]
\(i\) is the imaginary unit, defined as \(i^2 = -1\).