Answer:
6j^2 - 2j = 9
j^2 -(2/6)j = 9/6
j^2 - (2/6)j + 1/36 = 9/6 + 1 /36
(j - 1/6)^2 = 55/36
j - 1/6 = √55/36
j = (√55/36) + 1/6
j = 1.40
Explanation:
step 1 transpose 9 and it becomes positive.
step two divide everything by 6 so that j^2 has a coefficient of 1.
step 3 make a perfect square.
Then it's just simple calculations to get the answer