A/(b²-3)=88/(5²-3)=a/(9-3)⇒88/22=a/6;⇒a/6=4;⇒a=24;
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
а)2в(4а-в^2)
Б)2(а-в)с(а+в)=2с(а^2-d^2)