Question

1) Descompusa in factori expresia x³-x...este .....?
2)Daca a√5=√175 atunci a=?...
3)Descompuneti in factori: x²-10x+16 .......?
Ajutor va rog.... (nu.i nimic daca nu le stiti pe toate) !!!

Answer 1

1)  x³ - x = x( x² - 1) = x( x + 1) ( x - 1)

2). 175 :5 
      35 : 5
       7:7     
       1   => 5√7

a√5 = 5√7

a = $\frac{5 \sqrt{7} }{ \sqrt{5} } = \frac{5 \sqrt{35} }{5} = \sqrt{35}$

3).x² - 10x + 16= x² -2x - 8x +16 = x( x - 2) - 8(x - 2) = (x - 2)( x - 8)