Question

x.(2x-8) = -x² + 15x​

Answer 1

x(2x - 8) = -x² + 15x

2x² - 8x = -x² + 15x

2x² - 8x + x² - 15x = 0

3x² - 23x

x × (3x - 23) = 0

x = 0

3x - 23 = 0

x' = 0

x" = 23/3 ≈ 7,6