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(x-4)²=(x+8)(x-8)
x²-8x+16=x²-8²
-8x+16=-64
-8x=-80
x=10
1.21
n - dowolna liczba naturalna
n² + (n+1)² + (n+2)² = 3n² + 11
n² + n² + 2n + 1 + n² + 4n + 4 = 3n² + 11
3n² + 6n + 5 = 3n² + 11
6n=6
n=1
Te liczby to: 1, 2 ,3
1.22
(2k)² + (2k+2)² = 4k² + 4k² + 8k + 4 = 8k² + 8k + 4
8k² + 8k + 4 = 8k² + 12
8k = 8
k=1
Te liczby to 2 oraz 4
zadanie 1.2