Question

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

Answer 1

= (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