Answer:
x₁ = -3√2 , x₂ = 3√2
Step-by-step explanation:
x² = 18 ⇔ x = √18 or x= -√18
√18 = √[9•2] = √9•√2 = 3•√2 = 3√2
x₁ = -3√2
x₂ = 3√2
x² = 18
x ± 3√2
x = -3√2
x = 3√2
Hope this helped! :)
