if a²+b²+c²=30,a+b+c=10 then value of a +bc+ac?
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Answered by
129
- a² + b² + c² = 30.
- a + b + c = 10.
- ab + bc + ac = ?
➱The value of ab + bc + ac = 35.
Answered by
3
A+b+c=10
Squaring both both
(a+b+c)²=(10)²
=>a^2+b^2+c^2+2ab+2bc+2ca = 100
30+2(ab+bc+ca) =100}
=>2(ab+bc+ca)=100-30=70
=>ab+bc+ca=70/2=35
=>ab+bc+ca=35
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