21. Find x in the equation

The correct answer:

for a ¹ −1:

for a = −1:

x can be any number

% of subjects that isolated x properly

% of subjects who expressed x correctly, then simplified and specified the correct definition domain

% of subjects who did not reduce and didn’t specify the definition domain

% of subjects who expressed x correctly, specified the definition domain but did not reduce the resulting equation.

% of subjects who expressed x correctly  and reduced correctly,  but did not specify the domain definition

P

S.T

P

S.T

P

S.T

P

S.T

P

S.T

36

73

1

19

8

30

0

5

27

19

p = 0.05

p = 0.00