B5=0.4 b3=40 q-?
b4^2=0.4*40
b4^2=16
b4=4
q=b5\b4=0.4\4=0.1
Y=0
4x²=0
x=0 ________________________________________
Если есть вопросы- пишите
Х²+9х+8≥0; D=9²-4*8=81-32=49=7²; х=(-9-7)/2=-8; х=(-9+7)/2=-1 _____________
---------------------------(-8)--------------------------------------------(-1)----------------------------------
_______ + _____________________ - ____________________ + _______
х∈(-∞;-8]∪[-1;+∞)
X(x+2)=(x-4)(x+4)
x^2 + 2x = x^2 - 16
x^2 - x^2 + 2x = -16
2x = -16
x = -8