finad the value of a and b.. please provide the full solution of the question as soon as possible..!!!
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If a² + b² + c² = 90, a + b + c = 20, Find the value of ab + bc + ac.
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Taking a + b + c = 20
Then, (a+b+c)² = (20)²
a² + b² + c² + 2(ab+bc+ac) = 400
Then as a² + b² + c² = 90
90 + 2(ab+bc+ac) = 400
2(ab+bc+ac) = 400 - 90
(ab+bc+ac) = 310/2
ab + bc + ac = 155
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☺☺☺ Hope this Helps ☺☺☺
_________________________________________________________
Taking a + b + c = 20
Then, (a+b+c)² = (20)²
a² + b² + c² + 2(ab+bc+ac) = 400
Then as a² + b² + c² = 90
90 + 2(ab+bc+ac) = 400
2(ab+bc+ac) = 400 - 90
(ab+bc+ac) = 310/2
ab + bc + ac = 155
__________________________________________________________
☺☺☺ Hope this Helps ☺☺☺
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