hi everyone! i need your opinion on how to find range of function. eg: f(x,y)=x^{2}+y^{2}-1 thanks for all your responses!
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Originally Posted by nursyafika hi everyone! i need your opinion on how to find range of function. eg: f(x,y)=x^{2}+y^{2}-1 thanks for all your responses! If we square something we know that it will always be nonegative! This gives $\displaystyle x^2 \ge 0$ and $\displaystyle y^2 \ge 0$ So the smallest that the function can be is.... $\displaystyle f(x,y)=x^2+y^2-1 \ge 0+0-1=-1$ Can you finish from here?
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