Question

x(5 – 2x) + 2x(x - 1) = 15

tìm x

Answer 1

\(5x-2x^2+2x^2-2x=15\Leftrightarrow3x=15\Leftrightarrow x=5\)

Answer 2

\(\Leftrightarrow5x-2x^2+2x^2-2x=15\\ \Leftrightarrow3x=15\\ \Leftrightarrow x=5\)

Answer 3

x(5 – 2x) + 2x(x - 1) = 15

5x - 2x² + 2x² - 2x = 15

5x - 2x = 15

3x = 15

x = 15 : 3

x = 5.