Verified answer

1) x^2+x-5=0,

x1x2=-5,

x1+x2=-1,

x1^2x2^4+x2^2x1^4=(x1x2)^2(x2^2+x1^2)=(x1x2)^2((x1+x2)^2-2x1x2)=(-5)^2((-1)^2-2(-5))=25(1+10)=275

2)1≤(x+3)/4≤4,

4≤x+3≤16,

1≤x≤13,

2, 3, 5, 7, 11, 13

6 чисел

3) 1024=2^10,

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