Question

Choose the correct domain of 5x^2+1/2x-1.
the answer is All real numbers except 1/2
I NEED TO KNOW WHY =(

Answer 1

when x=1/2; what do you get?

Answer 2

0.5?

Answer 3

no, do the math

Answer 4

how did u come upon that answer though? what necessary steps would i have to take to stumble on that logic?

Answer 5

what do you get when x=1/2 ?

Answer 6

I'm not understanding your question? Do you mean when I plug it into the equation?

Answer 7

yes, since there isnt really much else to do with it is there?

Answer 8

u would get all decimals

Answer 9

show me, do the math

Answer 10

too long

Answer 11

too long? then you really dont want to know the answer do you :/

Answer 12

you get:\[\frac{2.5}{0}\]but that might take hours and days to figure out if we do it by hand right ....

Answer 13

so, what does 2.5/0 equal?

Answer 14

unknown

Answer 15

or undefined

Answer 16

correct, so if the answer cannot be determined; then we need to exclude it from the situation

Answer 17

the domain is all real values that make sense; x=1/2 doesnt make sense to us

Answer 18

oh ok i kinda get it thanx

Answer 19

when the value of a variable makes a denominator go zero, we exclude it from the domain