Answer:
j= -9, -2
Step-by-step explanation:
(j+9)(j+2)
j=-9, -2
j₁ = - 2
j₂ = - 9
j² + 11j + 18 = 0
j² + 9j + 2j + 18 = 0
j(j+ 9) + 2(j + 9) = 0
(j + 2)(j + 9) = 0
j + 2 = 0 => j₁ = - 2
j + 9 = 0 => j₂ = - 9
