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a= 1 , b= 4p , c = 4
x₁ + x₂= -b/a = - 4p
x₁ x₂ = c/a = 4
x₁x₂² + x₁²x₂ = 32
x₁ x₂ (x₁ + x₂)= 32
4(-4p) = 32
-16 p = 32
p = - 2