Х+х-250+2х=3270
4х=3270+250
4х=3 520
х=3 520:4
х=880
<span>x²</span><span>- 11х-42=0</span>
9х^2=4
х^2=4/9
х1=-2/3
х2=2/3
F(x)=4x+2x²-x³ [0;3]
f`(x)=4-4x-3x²=0
3x²+4x-4=0 D=64
x=2/3 x=-2 ∉ [0;3]
f(0)=4*0+2*0²-0³=0
f(2/3)=4*(2/3)+2*(2/3)²-(2/3)³=8/3+8/9-8/27=(8*9+8*3-8)/27=
=(72+24-8)/27=88/27=3⁷/₂₇=max
f(3)=4*3+2*3²-3³=12+18-27=3