Question

Express i^9 + i^10 + i^11 + i^12 in the form a + bi.​

Answer 1

Answer:

0

Step-by-step explanation:

${i}^{9} + {i}^{10} + {i}^{11} + {i}^{12} \\ - 1 \: + 1 - 1 + 1 \\ 0 \\ since\: {i}^{2} = - 1$