Х^3+4х^2-21х=0x(х^2+4x-21)=0
x=0 х^2+4x-21 =0
D=100
x1=(-4+10)/2=3
x2=(-4-10)/2=-7
Ответ 0,-7,3
P = 2(a + b) = 10
S = a*b = 6
a + b = 5
a*b = 6
a = 5 - b
b(5 - b) - 6 = 0 *
* - b^2 + 5b - 6 = 0
b^2 - 5b + 6 = 0
D = 25 - 24 = 1
b1 = ( 5 + 1)/2 = 6 /2 = 3;
b2 = ( 5 - 1)/2 = 4/2 = 2;
a1 = 5 - b1 = 5 - 3 = 2
b1 = 3
a2 = 5 - b2 = 5 - 2 = 3
b2 = 2
16-y^2-4y^3+2y+4y^3-16=-y^2+2y= - y*(y-2)
3 ^ ( x + 1 ) * 2 ^ x = 108
3 ^ x * 3 * 2 ^ x = 108
6 ^ x = 108 : 3
6 ^ x = 36
6 ^ x = 6 ^ 2
x = 2
2+0,3x≥0
0,3x≥-2
x≥-20/3
x∈[-6 2/3;∞)