Question

Rút gọn: (x + 2)² - (x + 2)(x - 2)

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Answer 1

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

Answer 2

Ta có:(x+2)²-(x+2)(x-2)=(x+2)(x+2-x+2)=4(x+2)

Answer 3

`(x+2)^2-(x+2)(x-2)`

`=x^2+4x+4-(x^2-4)`

`=x^2+4x+4-x^2+4`

`=4x+8`

Answer 4

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

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

=4x+8