Question

$4x2 - 20x + 25 = 0$

Answer 1

4x^2-20x+25
4x^2-10x-10x+25
2 x (2×-5)-5 (2x-5)
(2x-5)(2x-5)

Answer 2

If your question is 4x²-20x+25,

4x²-20x+25=0

4x²-(10+10)x+25=0

4x²-10x-10x+25=0

2x(2x-5)-5(2x-5)

(2x-5)(2x-5)

Then,

2x=5

x=5/2