Math Math and more math?

Question

If you substitute a test number for x in an equation, why is 0 not
always a good number to use? Give an example.

Answer 1

Because you cannot divide by zero...

Answer 2

There are many but i'll give the three main ones

1. x + 1/x = 1

in the above equation substituing x=0 will cause it 1/x to go to infinity
and we know that 0 + infinity can never be equal to 1!! It proves the equation wrong even when there is a real value for x.

2. x(x-2)=x-2

in the above equation susstitutin x=0 will reduce the equation to
0=-2, err why would you bother with that???

3. x(x-1)=0

if you use x=0 in the baove equation you get the ( that what YOU think) right answer for x. ie x=0. But, you have missed out another possiblity

when x(x-1)=0
either x=0 OR x-1=0
ie x=0 OR x=1

so missed out on another solution to the given equation

Hope this helps :)

Answer 3

0, 1 and 2 are always the worst numbers to use.

Answer 4

zero is not always a good number because you can't subract or divide a natural number from zero
example:
0-20 undefined
0/36 undefined

Answer 5

For linear equations, substituting 0 for x will give you the y-intercept. In that respect, it is useful. Aside from that, it doesn't provide any information.

If x is in the denominator of a non-linear equation, it will not give a defined answer.

Answer 6

The answer about dividing by zero is correct and...
Any multiple of zero is also zero and this may lead to incorrect conclusions about the equation states.

Answer 7

Dividing by zero would give you an error because you can;t divide by zero

Answer 8

because 0 could give you an undefined answer which you dont want

Answer 9

if we say x=0 that will give answers that not make any clue
eg: x * 4= X
x * 6= x ........
ps: and ofcours you cant divide with it !!!!!!!!!!