If a+b-c=7 and ab-bc-ca=14 find a²+b²+c²
Answers
Answered by
5
Step-by-step explanation:
(a+b-c)² = 49
a²+b²+c²+2(ab-bc-ac) = 49
a²+b²+c² = 49-2*14 = 49-28 = 21
Answered by
0
Answer:
21
Step-by-step explanation:
(a+b-c)² = 49
a²+b²+c²+2(ab-bc-ac) = 49
a²+b²+c²
= 49-2*14
= 49-28
= 21
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