document.write( "Question 1040542: I need help solving this problem please!\r
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document.write( "f(x) = sqrt(x+5) and g(x)=x-3\r
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document.write( "I need to find (f/g)(-1) and I'm coming up with:\r
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document.write( "sqrt((x+5)(x-3))/ x-3\r
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document.write( "I'm also asked to find the domain and come up with:\r
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document.write( "(−∞,−5]∪(3,∞)\r
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document.write( "am I on the right track?\r
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document.write( "Thank you for any guidance! \n" );
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Algebra.Com's Answer #655378 by Aldorozos(172)![]() ![]() ![]() You can put this solution on YOUR website! First you have to divide both functions \n" ); document.write( "Sqrt(x+5)/x-3 now you have to replace x with -1 \n" ); document.write( "Sqrt(-1+5)/(-1-3)= sqrt4/-4 2/-4= -1/2\r \n" ); document.write( "\n" ); document.write( "We know that sqrt can not be less than zero. In other words sqrt is always zero or greater than zero \n" ); document.write( "We also know that the denominator can't be zero \n" ); document.write( "Now we look at \n" ); document.write( "Sqrt(x+5) this has to be greater or equal to zero. This means that x has to be -5 or greater than -5\r \n" ); document.write( "\n" ); document.write( "We said that the denominator can't be zero. This means that x-3 can't be zero the only time x-3 is zero is when x is 3. Therefore x can't be 3\r \n" ); document.write( "\n" ); document.write( "We said x has to be -5 or greater and it can't be 3 \n" ); document.write( "The way we can rewrite this statement is \n" ); document.write( "[-5,3) and (3,infinitie) \n" ); document.write( "I think the statement you have written is not accurate when you said \n" ); document.write( "(Infiniti,-5]. By saying that you are saying the numbers less than -5 are acceptable. You can try -6 for example and put it under the square root. You will get sqrt(-6+5)=sqrt of -1 we know that we don't have any real number that if multipiled by itself could give us -1. In other words we can't have a nevative number under sqrt. This means the number has to be -5 or greater than -5. Also that nber can't be 3. \n" ); document.write( " \n" ); document.write( " |