- X^2 + 8X + 9 = 0
D = 64 -4*(-1)*9 = 64 + 36 = 100 ; V D = 10
X1 = ( - 8 +10 ) : (-2) = ( -1)
X2 = ( -18) : (-2) = + 9
27^2/3 – 16^1/4= (3³)^2/3 –(2^4)^1/4 = 3^6/3 -2^4/4 = 3²-2=9-2=7
OTBET: 7 D
9x^2 - 7x - 2 = 0
D = 49 + 8*9 = 121 = 11^2
x1 =( 7 + 11)/18 = 18/18 = 1;
x2 =( 7 - 11)/18 = - 4/18 = - 2/9