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2015-06-12T13:04:39+05:30
A^2 + b^2 + c^2 =220
ab+bc+ca=4

(a+b+c)^2 = a^2 + b^2 + c^2 + 2(ab+bc+ca)
⇒ (a+b+c)^2 = 220 + 2(4)
⇒ (a+b+c)^2 = 220+8
⇒ (a+b+c)^2 = 228
⇒ a+b+c = \pm√228
1 5 1
last line.plz explain
if a^2 = 25, then a = (plus or minus)√25
a can be 5 or -5....
similarly, here (a+b+c) can be √228 or -√228
that is the symbol for "plus or minus"
okh....got it