Question

If a+b+c=15 then a^2+b^2+c^2 =if a + b + C is equal to 15 then a square + b square + c square is equal to 3 then find out the value of a b BC and CA ​

Answer 1

a+b+c = 15

a²+b²+c² = 3

ab+bc+ac = ?

(a+b+c)² = a²+b²+c²+2ab+2bc+2ac

(a+b+c)² = a²+b²+c²+2(ab+bc+ac)

15² = 3 + 2(ab+bc+ac)

225 - 3 = 2(ab+bc+ac)

2(ab+bc+ac) = 222

ab+bc+ac = 111

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