Х+81х⁻¹=18|*x
х²+81=18x
(x+9)²=0
x+9=0
x=-9
<span>(a-25)^2 * (a+25)^2 = (а^2 - 50a + 625) * <span>(а^2 + 50a + 625) = a^4 + 50a^3 + 625a^2 -50a^3 - 2500a^2 - 31250a + 625a^2 + 31250a + 390625 = </span></span>
U^2−18u−19=u^2-2*9u+81-100=(u-9)^2-10^2=(u-9-10)(u-9+10)=(u-19)(u+1)
u1=19 u2=-1
х^2 +3х - 4=x^2+2*x*(3/2)+(9/4)-9/4-4=(x+3/2)^2-25/4=(x+3/2+5/2)(x+3/2-5/2)=
(x+4)(x-1)
x1=1 x2=-4
x^2-10x+21==x^2-2*x*5+25-4=(x-5)^2-2^2=(x-5-2)(x-5+2)=(x-7)(x-3)
x1=7 x2=3
A + 9x/a : ax + 9x^2 / a^2 = a +9/a^2 + 9x^2 / a^2 при а = -99, х = -66
-99 + 9/(-99)^2 + 9 * (-66)^2 / (-99)^2 = -99 + 1/1089 +4 = -95 + +1/1089 = -93 1088/1089
Нет корней у дискриминанта