(4x+3)(2x-5)-(2x-3)(3x+7)=ajutor


Răspuns :

^ inseamna la putere
8x^2-20x+6x-15-6x^2-14x+9x+21=2x^2-19x+6
(4 x + 3 )( 2 x - 5 ) - ( 2 x - 3)( 3 x + 7) =2 x² - 19 x + 6

= 8 x
² + 6 x - 20 x - 15 - ( 6 x² - 9 x + 14 x - 21 ) =

= 8 x² - 14 x - 15 - ( 6 x ² + 5 x - 21 ) =

= 8 x² - 14 x - 15 - 6 x² - 5 x + 21 =

= 2 x² - 19 x + 6