Answer to Question #125402 in Algebra for EMMANUEL

Question #125402

Find the domains of f(x)= (4-x2)1/2 and h(x)= (3-x)1/2.


1
Expert's answer
2020-07-07T17:21:54-0400

Given f(x)=4x2f(x)=\sqrt{4-x^2} ,h(x)=3x,h(x)=\sqrt{3-x},

f(x)f(x) is defined if 4x20    (2x)(2+x)04-x^2\geq 0\implies(2-x)(2+x)\geq0 . Thus, x[2,2]x\in[-2,2] ,hence the domain of ff is Df=[2,2]D_f=[-2,2] .

Now, h(x)h(x) is defined if 3x0    x(,3]3-x\geq0\implies x\in(-\infty,3] ,hence the domain of hh is Dh=(,3]D_h=(-\infty,3] .


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