Question

phan tich da thuc thanh nhan tu bang cach them bot cung 1 hang tu

:\(x^3+x^2+4\)

Answer 1

\(x^3+x^2+4\)

\(=x^3-x^2+2x^2+2x-2x+4\)

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

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

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

Answer 2

x³ + x² + 4 

= x³+ x² + 4 + 4³ - 4³

= (x + 4)³ - 4³

⁼ [(x+ 4 - 4)] [(x+4)²+ (x+4).4 + 4²] 

Answer 3

#) TL :
x³ + x² + 4

= x³ - x² + 2x² + 2x - 2x + 4

= x( x² - x + 2 ) + 2( x² - x + 2 )

= ( x + 2 )( x²- x + 2 )

Chúc bn hok tốt ạ ;3