ICSE Class 9 Answered
if a^2+b^2+c^2=20 and a+b+c=0 find ab+bc+ca
Asked by ck902183 | 10 Mar, 2024, 11:51: AM
Expert Answer
(a+b+c)2 = a2 + b2 + c2 + 2 ( ab + bc + ca )
if ( a+b+c) = 0 , then from above expression ,
( ab + bc + ca ) = - (1/2) ( a2 + b2 + c2 ) = -(1/2) × 20 = - 10
Answered by Thiyagarajan K | 10 Mar, 2024, 01:29: PM
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