" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
2n+3 kolejna
2n+5 kolejna
(2n+1)²+(2n+3)²+(2n+5)²=155
4n²+4n+1+4n²+12n+9+4n²+20n+25-155=0
12n²+36n-120=0 /:12
n²+3n-10=0
a=1 b= 3 c= -10
Δ=b²-4ac
Δ=9+40=49,√Δ=7
n₁=(-b-√Δ)/2a=(-3-7)/2=-5
n₂=(-b+√Δ)/2a=(-3+7)/2=2
n∈N
n=2
2n+1=5
2n+3=7
2n+5=9