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a=1 b=4 c= - 3
x₁x₂=c/a = - 3
x₁+x₂= - b/a= - 4
x₁x₂³+ x₁³x₂ = x₁x₂(x₂²+x₁²)
= - 3 ((x₁+x₂)²-2x₁x₂)
= - 3 ((-4)² - 2. -3)
= -3 (16+6) = -3 (22) = -66