Question

if a+b+c=9 and ab+bc+ca=40 find a²+b²+c² ​

Answer 1

Step-by-step explanation:

(a+b+c)

2

=a

2

+b

2

+c

2

+2(ab+bc+ca)

9

2

=a

2

+b

2

+c

2

+2×40

81=a

2

+b

2

+c

2

+80

a

2

+b

2

+c

2

=1

Answer 2

Answer:

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