Question

write appropriate property of 9+(-9)=

Answer 1

This is additive inverse property

The sum of a rational no and its additive inverse will always be 0.

therefore, 9+(-9) will be 0

Answer 2

$\mathcal{\underline{\blue{Additive Inverse Property}}}$

According to Additive Inverse Property,
When a Rational No. & its additive Inverse are added, the resultant sum is zero (0)

It is written as :

$\mathcal{\purple{a×(-a) = 0}}$

Here,
$a= 9$
$Its Additive Inverse = -9$

$a + (-a) = 0$

$\mathcal{\huge{\orange{Hope it helps}}}$