if a+ b + c = 9 and ab + bc + ca = 26 then find a2 + b2 +c2
Answers
Answered by
1
Step-by-step explanation:
(a+b+c)^2 = a^2 + b^2 + c^2 + 2ab+ 2bc + 2ca
(9)^2 = a^2 + b^2 + c^2 + 2(ab + bc + ca)
81 = a^2 + b^2 + c^2 + 2(26)
81 - 52 = a^2 + b^2 + c^2
29 = a^2 + b^2 +c^2
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question:
if a+ b + c = 9 and ab + bc + ca = 26 then find a^2 + b^2 +c^2
solution:
29
Given:
if a+ b + c = 9 and ab + bc + ca = 26
To find:
find a^2 + b^2 +c^2
step by step explanation:
(i) on squaring both sides , we have:
therefore:
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