Question

Evaluate the following limits. lim_{(x,y,z)rightarrow(1,1,1)}frac{x^2+xy-xz-yz}{x-z}

Limits and continuity
ANSWERED
asked 2021-02-05
Evaluate the following limits.
\(\lim_{(x,y,z)\rightarrow(1,1,1)}\frac{x^2+xy-xz-yz}{x-z}\)

Answers (1)

2021-02-06
We have to evaluate the limit of the function with three variable:
\(\lim_{(x,y,z)\rightarrow(1,1,1)}\frac{x^2+xy-xz-yz}{x-z}\)
After putting value of limit we get that it is \(\frac{0}{0}\) form
We can solve this limit by laws of factorization.
Solving by factorization,
\(\lim_{(x,y,z)\rightarrow(1,1,1)}\frac{x^2+xy-xz-yz}{x-z}=\lim_{(x,y,z)\rightarrow(1,1,1)}\frac{x^2-xz+xy-yz}{x-z}\)
\(=\lim_{(x,y,z)\rightarrow(1,1,1)}\frac{x(x-z)+y(x-z)}{x-z}\)
\(=\lim_{(x,y,z)\rightarrow(1,1,1)}\frac{(x-z)(x+y)}{(x-z)}\)
\(=\lim_{(x,y,z)\rightarrow(1,1,1)}(x+y)\)
\(=1+1\)
\(=2\)
Hence, value of given limit is 2.
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