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Expert-verified Found in: Page 632 ### Essential Calculus: Early Transcendentals

Book edition 2nd
Author(s) James Stewart
Pages 830 pages
ISBN 9781133112280 # Determine the set of points at which the function is continuous. $$f\left( {x,y,z} \right) = \sqrt {y{\rm{ - }}{x^2}} {l_n}z$$

$$\left\{ {\left( {x,y,z} \right)\left| {y \ge {x^2},z{\rm{ > }}0} \right|} \right\}$$

See the step by step solution

## Step-1: Finding Restriction on Domain

The function f is a composition of elementary function and is therefore continuous on its domain.

The square root function is defined so long as the expression inside the radical is non-negative.

Therefore, one restriction on the domain is $$y{\rm{ - }}{x^2} \ge 0$$or simply $$y \ge {x^2}$$.

## Step-2: Finding Another Restriction

Another restriction is z>o since the natural log function is only defined for positive real numbers.

The another restriction on the domain of f and hence, the set of aa points for which f is continuous is the combination of these two restrictions.

Hence, $$\left\{ {\left( {x,y,z} \right)\left| {y \ge {x^2},z{\rm{ > }}0} \right|} \right\}$$ ### Want to see more solutions like these? 