👤
Crebusti
a fost răspuns

calculati
a) (2x-3)²-(x+2)=
b) (3+5x)²-(2x+1)²=
c) (5x12y)²-(3x+y)²=

Răspuns :

IsabellaMarya
a.(2x-3)²-x+2=4x²-12x+9-x+2=4x²-13x+11
b. (3+5x)²-(2x+1)=9+30x+25x²-(4x²+4x+1)=9+30x+25x²-4x²-4x--1=8+26x+21x²

Cata4

a.) (2x-3)² - (x+2)    = 4x² - 12x +9 -x -2                              

                                = 4x² -13 x + 7

b) (3+5x)² - (2x+1)²   = 9 + 30x + 25x² - 4x² - 4x - 1                              

                                 = 21 x² + 26x  + 8
c) (5x12y)² - (3x+y)² =  3600xy - 9x² - 6xy - y²                                

                                 =  3594xy- 9x² - y²

 

Alte intrebari