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Class 9 Mathematics Exploring Algebraic Identities Algebraic identitiesHard

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If (a+b+c=9) and (a^2+b^2+c^2=35), what is (ab+bc+ca)?

Answer and explanation

Correct answer: (23)

(81=35+2(ab+bc+ca)), so (2(ab+bc+ca)=46) and the value is (23). Exam tip: find the double product sum first.

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Three Term Identity Given Values Ab Bc Ca Algebraic Identities Exploring Algebraic Identities Mathematics Class 9 Mcq

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