X2-11x+18=0 25x2-20x+4 3x2-5x+4 Pomogite pozalsta ostalas 6 minut

Question

X2-11x+18=0
25x2-20x+4
3x2-5x+4
Pomogite pozalsta ostalas 6 minut

Answer 1

25x²-20x+4=0
(5x-2)²=0
5x-2=0
5x=2
x=2/5

Comments

x^2 - 11x + 18 = 0
D = b^2 - 4ac = (-11)^2 - 4*1*18 = 121-72 = 49
VD = V49 = 7
x1 = (11+7)/2 = 18/2 = 9
x2 = (11-7)/2 = 4/2 = 2