Question

корень из (2х+9)=х-3

Answer 1

$sqrt{2x+9} = x-3 2x + 9 = (x - 3)^2 2x + 9 = x^2 - 6x + 9 8x - x^2 = 0 -x(x - 8) = 0 x(x - 8) = 0 x - 8 = 0 ; x = 0 x = 8$