Question

x^2 +6x +9

x^2 - 4x + 4

x^2 - 4

Giúp tớ 3 bài này với ạ

Answer 1

\(a,x^2+6x+9=x^2+2.3.x+\left(3\right)^2=\left(x+3\right)^2\\ b,x^2-4x+4=x^2-2.2.x+\left(2\right)^2=\left(x-2\right)^2\\ c,x^2-4=x^2-2^2=\left(x-2\right)\left(x+2\right)\)

Answer 2

\(x^2+6x+9=\left(x+3\right)^2\)

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

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

Answer 3

a)\(=\left(x+3\right)^2\)
b)\(=\left(x-2\right)^2\)
c)\(=\left(x-2\right)\left(x+2\right)\)

Answer 4

Answer 5

A. =( x + 3 )²

 B.=( x - 2 )²

 C.= (x - 2 ) ( x + 2 )