Т.А(1,2)
т.В(5,5)
нормально?
Y`=-3x²+2x+8=0
D=4+96=100
x1=(-2-10)/(-6)=2
x2=(-2+10)/(-6)=-4/3
_ + _
------------------(-4/3)-------------(2)-----------------
убыв min возр max убыв
(x - 3 - (3x - 2)) * (x - 3 + (3x - 2)) = 0;
(x - 3 - 3x + 2) * ( x - 3 + 3x - 2) = 0
( - 2x - 1) * ( 4x - 5) = 0
- 2x - 1 = 0;
- 2x = 1
x = - 1/2 = - 0,5
4x - 5 = 0
4x = 5
x = 5/4 = 1,25
Ответ:
- 0,5; 1.25
-1<5-4x<3
-1-5< -4x <3-5
-6< -4x < -2
-6 : (-4) > x > -2 : (-4)
1.5 > x > 0.5
0.5<x<1.5