If (a+b+c)= 10, a²+b²+c²=42 then find ab+bc+ca
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Answer:
see the attachment and it's answer is 45
Step-by-step explanation:
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Answer:
39
Step-by-step explanation:
Given,
a+b+c=10.....(1)
a²+b²+c²=42..(2)
To find ab+bc+ca
Square eq1 on both side.
(a+b+c)²=(10)²
a²+b²+c²+2ab+2bc+2ca=100
Put the value of eq2
42+2ab+2bc+2ca=100
2ab+2bc+2ca=100-42
2(ab+bc+ca)=58
ab+bc+ca = 58 / 2
ab+bc+ca = 39.
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