Question

b) (x-1)(x + 1) 

c) (x-2) (x mũ 2 +2x+4)

SOS

Answer 1

b) \(\left(x-1\right)\left(x+1\right)=x^2-1^2\)

c) \(\left(x-2\right)\left(x^2+2x+4\right)=\left(x-2\right)\left(x^2+2x+2^2\right)=x^3+2^3=x^3+8\)

Answer 2

\(\left(x-1\right)\left(x+1\right)\\ =x^2-1\)

 

\(\left(x-2\right)\left(x^2+2x+4\right)\\ =x^3-2^3\\ =x^3-8\)