16x^2-(4x-1)(4x-3)=13
16x^2-(16x^2-12x-4x+3)=13
16x^2-16x^2+16x-3=13
16x=13+3
16x=16
x=16:16
x=1
Ответ: 1
2) n(n+14)-(n-6)(n+4)=n^2+14n-(n^2+4n-6n-24)=n^2+14n-n^2-4n+6n-24 = 16n-24= 8*(2n-3) - делится на 8.
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16x^2-(4x-1)(4x-3)=13
16x^2-(16x^2-12x-4x+3)=13
16x^2-16x^2+16x-3=13
16x=13+3
16x=16
x=16:16
x=1
Ответ: 1
2) n(n+14)-(n-6)(n+4)=n^2+14n-(n^2+4n-6n-24)=n^2+14n-n^2-4n+6n-24 = 16n-24= 8*(2n-3) - делится на 8.