Question

$25 x^{2} =20x-4$

Answer 1

25x² = 20x - 4
25x² - 20x + 4 = 0
a = 25; b = - 20; c = 4

Δ = b² - 4ac
Δ = (-20)² - 4.25.4
Δ = 400 - 100.4
Δ = 400 - 400
Δ = 0

x = - b +/- √Δ     = - (-20) +/- √0
      ----------------   ----------------------
              2a                   2.25

x =   20
       -------
        50

R.: x = 2/5