Ответ:
y=kx+b, y=-3x+5..........................
7*-4=-28
-14 * -4= 56
7 * 1,5= 10,5
-14 * 1.5 = -21
Y = x^3 + x
Уравнение касательной:
y = f(x0) + f'(x0)*(x - x0)
f(x0) = f(2) = 2^3 + 2 = 8 + 2 = 10
f'(x) = 3x^2 + 1
f'(x0) = f'(x0) = 3*2^2 + 1 = 12 + 1 = 13
y = 10 + 13*(x - 2) = 13x + 10 - 26 = 13x - 16
Х=1,23434
10х=12,3434
1000х=1234,3434
1000х-10х=1234,3434-12,3434
990х=1222
х=1222/990