i(3i+6)(2−7i)
= (3i² + 6i)(2  7i) distributive property
= 6i²  21i³ + 12i  42i² foil method
= 21i³  36i² + 12i combined like terms
= 21(i²)(i)  36(1) + 12i broke down i³ and simplified i² to be 1
= 21(1)(i) + 36 + 12i simplified i² to be 1
= 21i + 36 + 12i multiplied
= 36 + 33i combined like terms
*McGenius*
