Question

(3x2-2x+9)-(3x-1)(x+4)

Answer 1

) (3x² - 2x + 9) - (3x - 1)(x+4) 

(3x² - 2x + 9) - (3x² - x+12x-4)= 

3x² - 2x + 9 - (3x² +11x-4)= 

3x² - 2x + 9 - 3x² -11x+4= 

-13x+13= -13(x-1) 

3)Fatore as expressões algébricas: 

b) 25x² - 4y² =(5x-2y)(5x+2y)


- Espero ter ajudado

Answer 2

( 3x² - 2x + 9 ) - ( 3x - 1) ( x + 4)
( 3x² - 2x + 9 ) - ( 3x² + 12x - 1x - 4 ) =
3X² - 2X + 9 - 3X² - 12X + X + 4 =
-13X  + 13 = 0
13X - 13 = 0
13X = 13
X = 13/13 = 1 ****