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(5x-2)²= ? Am uitat tema aceasta

Răspuns :

Se foloseste formula de calcul prescurtat : (a-b)²=a²-2ab+b²
=>(5x-2)²=25x²-20x+4
(5x-2)^2=
=(5x)^2-2•5x•2+2^2=
=20x^2-20x+4