p = (x-2) (x-4) (x-8) (x-16) ... (x-1024) при x=35 в excel

1) х² - 2 х = х+2-х²

х² - 2 х - х + х² - 2 = 0

2 х² - 3 х - 2 = 0

D = (-3) ² - 4*2 * (-2) = 9+16 = 25 = 5²

x1 = (3 - 5) / (2*2) = - 2/4 = -0.5

x2 = (3+5) / 4 = 8/4 = 2

2) 3 х² - 8 х + 13 = (х-5) ²

3 х² - 8 х + 13 = х² - 10 х + 25

3 х² - 8 х + 13 - х² + 10 х - 25 = 0

2 х² + 2 х - 12 = 0 |:2

x²+x - 6 = 0

D=1² - 4*1 * (-6) = 1 + 24 = 25 = 5²

x1 = (-1-5) / (2*1) = - 6/2 = -3

x2 = (-1+5) / 2 = 4/2=2