=4x square -4x+ 1-(9x square-1)+5x square -5x

=4x square -4x+ 1-9x square+1+5x square -5x

=-9x+2

When x= 2/9

=-9x+2=0

Your first step should be to expand the square of (2x- 1) with a complete square formula; (3x+ 1)(3x- 1) should be expanded by square difference; 5x(x- 1) should be multiplied directly.