Question

Is -5i(-2+5i).... 10i-25i^2?

Answer 1

That isnt wrong....but its not right either. A little more simplification can be done. DO you know \[i^{2} = ?\]

Answer 2

-1

Answer 3

nice, so plug that into your answer, and then you are done :)

Answer 4

so it would be 10i+50?

Answer 5

Almost, it would be:
\[10i-25i^{2} = 10i - 25(-1) = 10i+25\]

Answer 6

oh ok! great explanation!

Answer 7

For formalities, we always list complex numbers in the form a + bi, so the final answer would be:
\[25 + 10i\]

Answer 8

ahh ok, thank you again! you are so helpful!