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Mathias2003
a fost răspuns

1.(2x-√3)²
2.(2x•(√2-1 supra √2)
3. Descompune in factori expresia x²-2x-15



Răspuns :

(2x-√3)²=(2x)²-2•2x√3+√3²=4x²-4√3x+3

2x•(√2-1/√2)=2x•(√2-√2/2)=2x•√2/2=√2x

x²-2x-15
x²+3x-5x-15
x•(x+3)-5(x+3)
(x-5)(x+3)

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