Using the quadratic formula works but if you know there are 2 answers (highest power of problem tells you how many solutions) then
10x^2 = 5x
So either x = 0, giving 0=0. Or divide by 5x
2x = 1
x = 0.5
Round 1 player 1 because 12 is the greatest number
Given:
The given value is
.
To find:
The multiplicative inverse of
.
Solution:
We know that
is the multiplicative interval of
if
.
Let
be the multiplicative inverse of the given value
. Then,

Divide both sides by
.


Therefore, the multiplicative inverse of
is
. Hence the correct option is A.