Question

Giúp mk với mk cần gấp lắm

21x³+6x²+12x+8

X³+1-x²-x

(X+y)-x³-y³

X³+6x²+3x-1

Answer 1

\(x^3+1-x^2-x\)

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

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

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

Answer 2

đáp án 

=( x + 1 ) . ( x² + 1 )

hok tốt 

okazki

Answer 3

suy ra 

đáp án

=> ( x + 1 ) . ( x² + 1 )

hok tót

Answer 4

b) \(x^3+1-x^2-x\)

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

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

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

Answer 5

c) \(\left(x+y\right)-x^3-y^3\)

\(=\left(x+y\right)-\left(x+y\right)\left(x^2-xy+y^2\right)\)

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