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Friday
, 6 march 2015
Ecuatie de rezolvat
Proposed by
Gabi
(5 comments)
2.226
times displayed
Să se rezolve ecuaţia in
R
de mai sus.
View the Solution
Tags:
problema zilei
,
probleme de matematica
,
amuzante
,
matematica amuzanta
,
algebra
,
algebra rezolvata
,
ecuatii
,
numere reale
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Comments (5)
Friday
, 6 mar 2015 09:25
[#]
Arckangel
sqrt(x+1)=5-x | ^2 => x+1=25-x2 <=> x^2+x+1-25=0 |*2 <=> 2(x^2)+2x+2-50=0 => x^2+2x+1+x^2-49=0
Se separa in 2 si avem (x+1)^2+x^2-7^2=0 |*sqrt(1) => x+1+x-7=0 <=> 2x-6=0 => x=3.
Friday
, 6 mar 2015 09:55
[#]
dragosci
RE:
din cite stiu eu
(5-x)^2 = 25-10x+x^2
avem intr-adevar o solutie x=3, dar nu stiu daca in R mai avem inca una - las pe altii care stiu mai multa matematica :)
Friday
, 6 mar 2015 09:27
[#]
kage
x={3,8}
Friday
, 6 mar 2015 09:33
[#]
Arckangel
RE:
daca ar fi 8, egalitatea ar deveni 3=-3
Friday
, 6 mar 2015 16:47
[#]
kage
RE:
asa-i, mama lui de minus. am rezolvat-o in cap, si am uitat de semn.
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