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descompuneti in factori :
 [tex]25 x^{2} - 9 [/tex]
[tex]( 3x-2) ^{2} -4 x^{2} [/tex]
[tex] x^{2} -7x[/tex]
[tex] x^{2} +7x+6[/tex]
 [tex] x^{2} +10x+25[/tex]




Răspuns :

= (5x-3)(5x+3)

= (3x-2+2x)(
3x-2-2x)

= (x+ √7)(x-√7)

= x² + (6+1)x + 6 = x² + 6x + x + 6 = x(x+6) + 1 (x+6) => (x+1)(x+6)

 = (x+5)²