Math, asked by zareenmemon540, 11 months ago

ab+bc+ca when q+b+c =13 and a²+b²+c²= 69​

Answers

Answered by nvarshasri
2

Answer:

a+b+c= 13

Whole square on both sides:

a^2+b^2+c^2+2ab+2bc+2ca= 169.................identity

69+ 2[ ab+bc+ca ] = 169

2{ ab+bc+ca } = 100

ab+bc+ca = 50.

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