Question

Thực hiện phép tính: (x-3)(3+x)

Answer 1

   (\(x\) - 3).(3 + \(x\)) 

= 3\(x\) + \(x^2\) - 9 - 3\(x\)

= \(x^2\) - 9 

Answer 2

\(\left(x-3\right)\left(3+x\right)\\ =\left(x-3\right).3+\left(x-3\right).x\\ =3x-9+2x-3x\\ =3x-9-x\\ =3x-x+9\\ =2x+9.\)

Answer 3

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

Answer 4

Dương làm sai rồi nha

Answer 5

(x - 3)(3 + x)

= 3x + x² - 9 - 3x

= x² - 9

Answer 6

x² - 9

Answer 7

(x-3)(3+x)

=(x-3)(x+3)

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

=\(x^2-9\)