Question

rpdd va rog vreau decat exercitiul 9 B​

Answer 1

Răspuns:

a) 4(a+1)²-9=[2(a+1)+3][2(a+1)-3]=(2a+5)(2a-1)=4a²+8a-5

b) 25(2x+1)²-16=[5(2x+1)+4][5(2x+1)-4]=(10x+9)(10x-1)=100x²+80x-9

c) 4(2x-3)²-9=[2(2x-3)+3][2(2x-3)-3]=(4x-3)(4x-9)=16x²-48x+27

d) 9x²-(3x-2)²=[3x+(3x-2)][3x-(3x-2)]=(6x-2)·2=12x-4

e) 16(x+2)²-25=[4(x+2)+5][4(x+2)-5]=(4x+13)(4x-3)=16x²+40x-39

f) 9(x+3)²-4x²=[3(x+3)+2x][3(x+3)-2x]=(5x+9)(x+9)=5x²+54x+81

g)25x²-(2x+1)²=[5x+(2x+1)][5x-(2x+1)]=(7x+1)(3x-1)=21x²-4x-1

h) 25(3x+1)²-4x²=[5(3x+1)+2x][5(3x+1)-2x]=(17x+5)(13x+5)=221x²+150x+25

Explicație pas cu pas:

Formula diferentei de patrate: a²-b²=(a-b)(a+b)

Answer 2

Răspuns:

Explicație pas cu pas: