If ab + bc + ca = 27 and a2 + b2 + C2 = 90,
find the value of a + b + c.
Answers
Answered by
14
answer:
a+b+c=12
explanation:
(a+b+c)²=a²+b²+c²+2ab+2bc+2ca
=90+2(ab+bc+ca)
=90+2 x 27
=90+54
=144
(a+b+c)=144
a+b+c=square root 144
a+b+c=12
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