Question

simplify (-5+6i)(2+5i)

Answer 1

Use FOIL to start with.
Then remember that \(i^2 = -1\).

Answer 2

-10-13i?

Answer 3

No. That's not what I get.
Did you FOIL it first?

Answer 4

yes

Answer 5

ok lets see

Answer 6

Can you show me your FOIL step?

Answer 7

ok first your answer is not correct

Answer 8

\[(-5+6i)(2+5i)=-5*2+(-5)*5i+6i*2+6i*5i=-10-25i+12i+30i ^{2}\]
\[=-10-13i+30i ^{2}\]
and we know that \[i ^{2}=-1\]
so
\[=-10-13i+30i ^{2}=-10-13i+30*(-1)=-10-13i-30=-40-13i\]