(х-х1)(х-х2)
(Х-0)(х-2)=х(х-2)=х²-2х
1)5x^2+20x+20=-<span>6x+44,</span>
<span>5x^2+14x-24=0</span>
<span>D=196+4*24*5=676=26^2</span>
<span>x1=1.2 x2=-3</span>
<span>2)2x^2+7x-4=3x^2+11x</span>
<span>-x^2-4x-4=0</span>
<span>x^2+4x+4=0</span>
D=16-16=0
x=-4/2=-2
Общий знаменатель 18 и 21 = 126
(5р+2)/(р^2-q^2)-(5q+2)/(p^2-q^2)=(5p+2-5q-2)/(p^2-q^2)=
=5 (p-q)/(p-q)(p+q)=5/(p+q)