Question

(3x² - 2x +9 ) - ( 3x - 1 ) ( x + 4 )

Answer 1

(3x²-2x+9)-(3x-1).(x+4)
(3x²-2x+9)-(3x²+12x-x-4)
3x²-2x+9-3x²-12x+x+4
-13x²+13

Answer 2

$3 x^{2} -2 x+9 - (3x-1) . (x+4) =0 3 x^{2} -2 x+9 - 3 x^{2} +12x-x-4=0 3 x^{2} -2 x+9 - 3 x^{2} -11x+4=0 -13x+13=0 -13x=-13 x=-13/13 x=-1 espero ter ajudado$