Question

Ajutor!Dau 15 puncte.​

Answer 1

Răspuns:

Explicație pas cu pas:

E(x) = (3x-1)²-(x-1)²+(2x+1)(3x+4)-3x-4

E(x) = (3x-1-x+1)(3x-1+x-1)+(2x+1)(3x+4)-(3x+4)

E(x) = 2x·(4x-2) + (3x+4)(2x+1-1)

E(x) = 2x·(4x-2)+2x(3x+4)

E(x) = 2x·(4x-2+3x+4)

E(x) = 2x·(7x+2)

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a) [(3x-1)²-(x-1)²]:(2x) = (3x-1-x+1)(3x-1+x-1) : (2x) =

= 2x·(4x-2):(2x) = 4x-2

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b) E(m) = 2m·(7m+2) = numar par deoarece este divizibil cu 2.

oricare ar fi m ∈ Z