SA3 marksYear: 2024MediumCBSE Class 10
polynomialszeroessum-product-relation
Question
If α and β are the zeroes of the polynomial x2+x−2, then find the value of βα+αβ.
Solution
1
α+β=−1 and αβ=−2
+0.5 marks2
βα+αβ=αβα2+β2=αβ(α+β)2−2αβ
+1 mark3
=−2(−1)2−2(−2)=−21+4=2−5
+1.5 marks