Answer: 19
Step-by-step explanation:
Using the sum of an arithmetic series formula,
Multiplying the second equation by 2 gives us .
Subtracting this from the second equation, we get that .
Substituting this back into the first equation, we get that .
Therefore,
can also be written as 2i
where i = √-1
Rationalizing denominator,
Use the quadratic formula
x=2+1/2 square root of 6 or x=2+(-1/2) square root of 6
Solution is in attachment !