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2X₁X₂² + 2X₁²X₂ = 2X₁X₂(X₁+X₂) = 2c/a . (-b/a) = 2(-6/2). (-3/2) = 2. 18/4 =2. 9/2 =9
11) 3X² -X +9
X₁/X₂ + X₂/X₁ = (X₁² + X₂²)/ X₁X₂ =[(X₁ + X₂)² -2X₁X₂]/X₁X₂
=[(-b/a)² -2c/a]/(c/a)
=[(1/3)² - 2. 9/3]/ (9/3)
=(1/9 - 6)/3 =( -53/9)/3 = -53/27