The sum of the roots of the equation,
x^2 + | 2x - 3| - 4 = 0, is :-
(1) - 2
(2) -(2)^1/2
(3) (2)^1/2
(4) 2

Question

The sum of the roots of the equation,
x^2 + | 2x - 3| - 4 = 0, is :-
(1) - 2 
(2) -(2)^1/2
(3) (2)^1/2
(4) 2

anonymous · Answer

i think there is some problem with the question
because when i sub in all the answers, non of them equal to 0

anonymous · Answer

but the solution should be like this
| 2x - 3|=4-x^2
[(2x-3)^2]^(1/2)=4-x^2
(2x-3)^2=(4-x^2)^2
expand it and it will become
x^4-4x^2+12x+7=0

anonymous · Answer

Options you are substituting are sum of roots not the roots of equation ! 

Answer is C $$\sqrt{2}$$ but dont know how :(

anonymous · Answer

should have some problem with the question
because if sub 2^1/2 the answer is not equal to 0 as well
or you can just mark it and ask your tutor tomorrow =]

anonymous · Answer

you can't substitute 2^1/2 because it is sum of roots not the root of equation !