What is the complex number of 7 plus square root of -121?

7 + sqrt(-121) =>

7 + sqrt( -1 X 121) =>

7 + sqrt(-1) X sqrt(121) =>

7 + sqrt(-1) *+/-11 = >

7 +/= 11sqrt(-1)

The sqrt(-1) is designated the letter 'i' ( small /lower case 'i').

Hence

7 +/- 11i

NB If you can find the 'square root of '-1'' , then the mathemtical world. would like to hear from you.