Question

Ce formula se folosește aici ? îmi arata cineva cum se face ?
$( {x}^{2} + x - 1)( {x}^{2} - 2x + 1)$
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Answer 1

Raspuns:

($x^{2}$ +$x$ -1)([tex]x^{2} [/tex] -2x +1)=

[tex]= x^{4} - 2x^{3} +x^{2} +x^{3} -2x^{2} +1-x^{2} +2x-1=\\ =x^{2} -x^{3} -2x^{2} +3x-1[/tex]

Formula de calcul:

$(x^{2} +x-1) ==> (a+b)^{2}$

$(x^{2} -2x+1) ==> (a-b)^{2}$