Question

x²-(x-20)=2000 .......

Answer 1

x² - x + 20 = 2000
x² -x + 20 - 2000 = 0
x² -x - 1980 = 0
Δ = -1² - 4 . 1 . - 1980
Δ = 1 + 7920 = 7921
x = (1 +- √7921)/2
x = (1 +- 89)/2

x' = (1+89)/2 -> 90/2 -> 45
x'' = (1-89)/2 -> -88/2 -> -44

Answer 2

 X²-(x-20)=2000 x² -x+20=2000 x² -x-1980=0 x=45