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# Maths help pls watch

1. For this question it states that 'the domain of each of the following functions is the set of values of x for which the algebraic expression has meaning.Find their ranges.'
What does it mean for an algebraic expression to have a meaning in this context?
2. (Original post by surreal123)
For this question it states that 'the domain of each of the following functions is the set of values of x for which the algebraic expression has meaning.Find their ranges.'
What does it mean for an algebraic expression to have a meaning in this context?
E.g. - that's the inverse, not the reciprocal - is only meaningful for -1 <= x <= 1

is only meaningful for x>0.

Assuming we're sticking to real numbers.
3. A physical example would be that you might have an equation for distance that went like:

distance = x + 2.

x>= -2 would be the range of meaning here because you cannot have a negative distance.
4. (Original post by ghostwalker)
E.g. - that's the inverse, not the reciprocal - is only meaningful for -1 <= x <= 1

is only meaningful for x>0.

Assuming we're sticking to real numbers.
Thank you!

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