Question

Tìm x biết

\(4x^2-20x+25=16\)

 

 

 

Answer 1

4x² - 20x + 9 = 0

(4x^2 - 2x) - (18x - 9) = 0

2x(2x - 1) - 9(2x - 1) = 0

(2x - 1)(2x - 9) = 0

2x - 1 = 0 hoặc 2x - 9 = 0

x = 1/2 hoặc x = 9/2

Answer 2

4x² - 20x + 9 = 0

(4x^2 - 2x) - (18x - 9) = 0

2x(2x - 1) - 9(2x - 1) = 0

(2x - 1)(2x - 9) = 0

2x - 1 = 0 hoặc 2x - 9 = 0

x = 1/2 hoặc x = 9/2