Hello and sorry if I'm not posting in the right section, but I have the following problem:

If a and b are rational numbers and sqrt from a+b does Not equal 0, how do I demonstrate that sqrt from a-b does not equal 0?

Hello and sorry if I'm not posting in the right section, but I have the following problem:

If a and b are rational numbers and sqrt from a+b does Not equal 0, how do I demonstrate that sqrt from a-b does not equal 0?

If a and b are rational numbers and sqrt from a+b does Not equal 0, how do I demonstrate that sqrt from a-b does not equal 0?

- stapel_eliz
**Posts:**1738**Joined:**Mon Dec 08, 2008 4:22 pm-
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smara1403 wrote:Hello and sorry if I'm not posting in the right section, but I have the following problem:

If a and b are rational numbers and sqrt from a+b does Not equal 0, how do I demonstrate that sqrt from a-b does not equal 0?

I'm not familiar with your terminology. Are you perhaps referring to square roots "of" a+b and a-b? If so, is the exercise along the lines of the following?

In particular, are you supposed to prove, or maybe DIS-prove with a counter-example (such as when b = a)?

no, i'm sorry

i meant a+sqrt(b) !=0 and prove a-sqrt(b)!=0, where sqrt stands for square root and != for does not equal

i'm sorry for my terminology, but i'm not used to the english one

i meant a+sqrt(b) !=0 and prove a-sqrt(b)!=0, where sqrt stands for square root and != for does not equal

i'm sorry for my terminology, but i'm not used to the english one

- stapel_eliz
**Posts:**1738**Joined:**Mon Dec 08, 2008 4:22 pm-
**Contact:**