Question

Rút gọn:

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

Answer 1

\(\left(x+3\right)^2-\left(x-2\right)\left(x+2\right)=\left(x^2+6x+9\right)-\left(x^2-4\right)=x^2+6x+9-x^2+4=6x+13\)

Answer 2

( x + 3 )² - ( x - 2 ) ( x + 2 ) 

=  ( x² + 6x + 9 ) - ( x² - 4 )

= x² + 6x + 9 - x² + 4 = 6x + 13