Rozwiąż równanie: r^2 + (r-7)^2 = (r+1)^2
r² + (r-7)² = (r+1)²
r²+r²-14r+49=r²+2r+1
r²-16r+48=0
Δ=256-192=64
√Δ=8
r₁=4 v r₂=12
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r² + (r-7)² = (r+1)²
r²+r²-14r+49=r²+2r+1
r²-16r+48=0
Δ=256-192=64
√Δ=8
r₁=4 v r₂=12