If a+b+c = 9, a^2+b^2+c^2 = 29....Find ab+bc+ca.
Answers
Answered by
1
=>(a+b+c)²=81
=>a² + b² + c² + 2ab + 2bc + 2ca = 81
=>29 + 2( ab+ bc+ ca) = 81
=>2( ab+ bc+ ca) = 52
=> ab+ bc+ ca = 26
Ans.-} 26
Similar questions