Question

VA ROG MULT EXERCITIILE 3,4 DAU MULTE PUNCTE

Answer 1

3)

a)  121²-144y²=(11x-12y)(11x+12y)

b) [(a+1)-2][(a+1)+1]=(a-1)(a+3)=a²+2a-3

c) 9-(2b+3)²=[3-(2b+3)][3+(2b+3)]=2b(2b+6)=4b²+12b

d) 16c²-(3c+5d)²=[4c-(3c+5d)[4c+3c+5d}=(c-5d)(7c+5d)=7c²+5cd-35cd-25d²=7c²+5cd-35cd-25d²=7c²-25d²-30cd

e) 9(5m-4p)²-64m²=[3(5m-4p)-6][3(5m-4p)+6m]=(15m-12p-6)(15m-12b+6m)

225m²-........

4)

a) 36x³-x=x(36x²-1)=x(6x+1)(6x-1)

b) 20x²-5y²=5(4x²-y²)=5(2x-y)(2x+y)

c) 9xy²-9x=9x(y-1)(y+1)