if a²+b²+c²=48
and a+b+c=7
find ab+bc+ca
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Answered by
1
Answer:
1/2
Step-by-step explanation:
a+b+c=7
(a+b+c)²=49
a²+b²+c²+2ab+2bc+2ac = 49
2(ab+bc+ca)= 49-48
ab+bc+ca= 1/2
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