For i = √−1 , what is the sum (7 + i) + (−8 + 9i ) ? √ is the square root symbol.
a) −1 + 12i
b) −1 − 6i
c) 15 + 12i
d) 15 − 6i

Question is incomplete, complete question is given below;

For i = √−1 , what is the sum (7 + 3i) + (−8 + 9i ) ? √ is the square root symbol.

A) −1 + 12i

Step-by-step explanation:

Given,

We have to find the sum of.

Solution,

Firstly we Substitute the the value of 'i' in given expression.

On combining the like terms, we get;

On we use the addition property of equality and get;

Since = i

Then we can say that;

=

Hence The sum of is  .

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thus, the first answer choice, y = sec x, is the correct one