4х+12+5х-15=105
9х-3=105
9х=105+3
9х=108
Х=108:9
Х=12
4(12+3)+5(12-3)=60+45=105
Y=f`(x0)(x-x0)+f(x0)
f(1)=2
f`(x)=3x^2+2x
f`(1)=5
y=5(x-1)+2
y=5x-3
4(1 - 5x) = 9 - 3(6x - 3)
4 - 20x = 9 - 18x + 9
-18x + 20x = 4 - 9 - 9
2x = -14
x = -7
Ответ: -7
y'=2cos(6x^3-x^2+1)*[-sin(6x^3-x^2+1)]*(18x^2-2x)=(2x-18x^2)sin(12x^3-2x^2+2)