Question

If x^2+x = 3

then x^4+x = ??

Answer 1

whats the idea behind ur question? :)

Answer 2

i got an old GRE math practice test ;)

Answer 3

im thinking let x = 3-x^2
and let x^2 = 3-x

and sub into the other one

Answer 4

options are:

A. x^2+3
B. 4(3-x)
C. 3(x-1)
D. 6(2-x)
E. 3x

i havent checked the answer key tho ...

Answer 5

\[3-x^2+(x-3)^2=12-6x=6(2-x)\]unfortunately GRE test is too expensive in my country :(

Answer 6

so D :)

Answer 7

i like D

answer key likes D

tehn D it is :)