Question

If a+b+c=9 and ab+bc+ca=40 find a square+b square+c square

Answer 1

Answer:

a square +b square +c square -3abc

Step-by-step explanation:

a+b+c (a square +b square +c square +ab+bc+ca)

9 (a square +b square +c square +40

a²+b²+c² = 40-9

a²+b²+c² = 31

Answer 2

Answer:

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