a+b+c=6 , a square +b square +c square=20, ac+bc+ca =???
Help me plz
Its of 9th grade :/
Answers
Answered by
1
(a+b+c)² = a² + b² + c² + 2(ab + bc + ac)
given: a+b+c = 6
a²+b²+c² = 20
(6)² = 20 + 2(ab+bc+ac)
=> 36 = 20 + 2(ab+bc+ac)
=> 16 = 2(ab+bc+ac)
=> ab+bc+ac = 8
hope it helps u
given: a+b+c = 6
a²+b²+c² = 20
(6)² = 20 + 2(ab+bc+ac)
=> 36 = 20 + 2(ab+bc+ac)
=> 16 = 2(ab+bc+ac)
=> ab+bc+ac = 8
hope it helps u
yoyo23xtto:
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Answered by
1
Given,
a+b+c=6
a²+b²+c²=20
a²+b²+c²=(a+b+c)²-2ab-2bc-2ca
20=(6)²-2(ab+bc+ac)
-2ab+bc+ac=20-36
ab+bc+ac=(-16/-2)= 8
a+b+c=6
a²+b²+c²=20
a²+b²+c²=(a+b+c)²-2ab-2bc-2ca
20=(6)²-2(ab+bc+ac)
-2ab+bc+ac=20-36
ab+bc+ac=(-16/-2)= 8
Umm..down its different answer..ugh whom of u r right..?
mime is right
CD
Ty..
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