if a+b+c=9 and ab+bc+ca=40 find a²+b²+c²
Answers
Answered by
2
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
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