-(x-2)(9-x)(x+10)>0
(x-2)(x-9)(x+10)>0
x=2 x=9 x= -10
- + - +
--------- -10 ---------- 2 ------------- 9 -----------
\\\\\\\\\\\\\ \\\\\\\\\\\\\\
(-∞; -10) x= -11 - - - | -
(-10; 2) x=0 - - + | +
(2; 9) x=3 + - + | -
(9; +∞) x=10 + + + | +
x∈(-10; 2)U(9; +∞)
Х² + рх - 16=0, х=-2
(-2)² +р(-2)-16=0
4-2р-16=0
2р=-12
p=-12/2
p=-6
x²=(-2)²=4
= 25X^2 - 36 - 25X^2- 8X - 49 = - 8X - 85 = - 8*70 - 85 = - 560 - 85 = - 645