Question

exercițiul 12 va rog!!!!!dau coroana

Answer 1

a) (x + 4)(x -3)- (x – 1)(x + 6)= x²-3x+4x-12-x²-6x+x+6= -4x-6

b) (7x – 1)(x – 3) – 5(x+ 2)(x + 4)=7x²-21-x+3-5(x²+4x+2x+8) = 7x²-21-x+3-5x²-20x-10x-40=2x²-31x-58

c) (2x – 1)(x+ 3) – 2(x² + x + 1)=2x²+6x-x-3-2x²-2x-2=3x-5

d) (x- 3)[2x – 3(x – 1)] + x(x + 5)= (x- 3)(2x – 3x+3)+ x(x + 5)= (x- 3)(-x+3)+ x(x + 5)= -x²+3x+3x-9+x²+5x=11x-9

e) (2x – 3)[3x – 2(x+ 1)] +x(2x – 1)=(2x – 3)(3x – 2x+2) +x(2x – 1)= (2x – 3)(x+2)+x(2x – 1)=2x²+4x-3x-6+ 2x²-x= 4x²-6