If a+b+c=15 a²+b²+c²=77 find ab+bc+ca

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If a+b+c=15 a²+b²+c²=77 find ab+bc+ca @DeeptiMukherjee1
Here a+b+c=15
a²+b²+c²= 77
By formula,
(a+b+c)² = a²+b²+c²+2(ab+bc+ca).
This formula is algebraic identity. I have solved the problem using the above algebraic identity.
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Deepti Mukherjee
  1. Serial learning
  2. if a b c=15 a² b² c²=77 find ab bc ca
  3. find ab bc ca
  4. polynomials
  5. formula for (a b c)²
  6. algebraic identity
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