Question

${ - 4 \times }^{2} + 20x - 25 = 0$

Answer 1

-4x+20x-25=0
16x-25=0
16x=25
x=25
16

Answer 2

$-4x^2 +20x -25 =0\\\\multiplicando\ por \ -1\\\\4x^2-20x+25=0\\\\Delta=(-20)^2-4*4*25\\\\Delta=0\\\\x= \frac{-b}{2a}\\\\x= \frac{20}{8}\\\\x= \frac{5}{2}$