Question

Calcule os produtos:

Answer 1

a) (x+1)²=(x+1)(x+1)=x²+x+x+1=x²+2x+1
b) (x-2)²=(x-2)(x-2)=x²-2x-2x+4=x²-4x+4 
 


a) (2x-1)(2x+1)=4x²-2x+2x-1=4x²-1

b) (5-3y)(5+3y)=25-15y+15y-9y²=25-9y²

c) (2mn+5)(2mn-5)=4m²n²+10mn-10mn-25=4m²n²-25

d) ( $\frac{x}{2}$-$\frac{y}{3}$)($\frac{x}{2}$+$\frac{y}{3}$)=x²/4 -xy/6 +xy/6 -y²/9=x²/4-y²/9