y=2x^2-3x+1 при y=2-x

Question

y=2x^2-3x+1 при y=2-x

Answer 1

y штрих [=4x-3

подствл

2-x=4x-3

2=3=4x+x

5=5x

x=1

Answer 2

2 - X = 2X^2 - 3X + 1

2X^2 - 3X + 1 - 2 + X = 0

2X^2 - 2X - 1 = 0

D = 4 - 4*2*(-1) = 4 + 8 = 12

V D = 3.46

X1 = 2 + 3.46 \ 4 = 1.365

X2 = 2 - 3.46 \ 4 = - 1.46\4 = - 0.365

...........................

Y = 2 - X

Y1 = 2 - 1.365 = 0.635

Y2 = 2 + 0.365 = 2.365