Destinyyyy
  • Destinyyyy
Help with three problems.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Destinyyyy
  • Destinyyyy
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Destinyyyy
  • Destinyyyy
I got -1, 5, 5
Destinyyyy
  • Destinyyyy
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More answers

Nnesha
  • Nnesha
how did you get -1 ?
Destinyyyy
  • Destinyyyy
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Destinyyyy
  • Destinyyyy
I did the first equation x=/ 5
Nnesha
  • Nnesha
yes right so substitute x for 3
Destinyyyy
  • Destinyyyy
Omg I see what I did.. 8 is the correct answer
Nnesha
  • Nnesha
yes right
Destinyyyy
  • Destinyyyy
I miss read my own writing. I thought I wrote x^3 when it was x^2
Destinyyyy
  • Destinyyyy
Are the other two answers correct?
Nnesha
  • Nnesha
yes
Destinyyyy
  • Destinyyyy
Okay.. For the other two questions I posted im stuck.
Destinyyyy
  • Destinyyyy
I got to 10/ (x+h) - 10/x all over h
Destinyyyy
  • Destinyyyy
lcd= x(x+h) .. My example does something weird so im stuck here
Nnesha
  • Nnesha
how did you get 10 ? can you please show the work so i can find the mistakes :=)
Destinyyyy
  • Destinyyyy
Oh my gosh. Sorry it some how posted the same question twice and not the correct question 22.. One second
Destinyyyy
  • Destinyyyy
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Destinyyyy
  • Destinyyyy
That picture above is the question I was talking about.. @Nnesha
Nnesha
  • Nnesha
oh alright wait a sec
Destinyyyy
  • Destinyyyy
Okay. Sorry about that
Nnesha
  • Nnesha
\[\huge\rm \frac{\color{ReD}{ \frac{ 10 }{ x+h }-\frac{ 10 }{ x}} }{ h }\] first deal with the top red part find the common denominator
Destinyyyy
  • Destinyyyy
x(x+h)
Nnesha
  • Nnesha
yes right so what about the numerator ?
Nnesha
  • Nnesha
\[\huge\rm \frac{\color{ReD}{ \frac{??? }{ x(x+h )} } }{ h }\] multiply the numerator of first by denominator of the 2nd fraction multiply the numerator of 2nd fraction by denominator of first fraction
Destinyyyy
  • Destinyyyy
Um what? I assumed it would leave me with 10x- 10(x+h) all over h
Nnesha
  • Nnesha
that's the numerator of top fraction \[\huge\rm \frac{\color{ReD}{ \frac{10x-10(x+h) }{ x(x+h )} } }{ h }\] like this
Destinyyyy
  • Destinyyyy
??? How do you still have x(x+h) shouldnt it cancel out?
Nnesha
  • Nnesha
how would you cancel out that ? that's our common denominator
Destinyyyy
  • Destinyyyy
Thats what happens when you get rid of fractions..
Nnesha
  • Nnesha
alright here is the example \[\huge\rm \frac{ a }{ b } +\frac{ b }{ d}\] \[\huge\rm \frac{ ad+ cb }{ bd }\]i would the common denominator
Destinyyyy
  • Destinyyyy
Um okay?
Destinyyyy
  • Destinyyyy
Whats the next step?
Nnesha
  • Nnesha
\[\huge\rm \frac{\color{ReD}{ \frac{10x-10(x+h) }{ x(x+h )} } }{ h }\] we should change division to multiplication to do that you should multiply the top with the `reciprocal` of the bottom
Destinyyyy
  • Destinyyyy
Bottom as in x(x+h) or h?
Nnesha
  • Nnesha
\[\huge\rm \frac{\color{ReD}{ \frac{ a }{ b }} }{ \frac{ c }{ d } }=\color{reD}{\frac{a}{b}} \times \frac{d}{c}\] like this
Nnesha
  • Nnesha
\[\huge\rm \frac{\color{ReD}{ \frac{10x-10(x+h) }{ x(x+h )} } }{ \frac{h}{1} }\] h
Nnesha
  • Nnesha
h is same as h over 1
Destinyyyy
  • Destinyyyy
Multiple by h/1?
Destinyyyy
  • Destinyyyy
10x-10(x+h)/x(x+h) * h/1
Nnesha
  • Nnesha
what is the reciprocal of h/1 ?
Destinyyyy
  • Destinyyyy
1/h
Nnesha
  • Nnesha
yes so multiply bye 1/h
Destinyyyy
  • Destinyyyy
Okay
Nnesha
  • Nnesha
\[\huge\rm \color{ReD}{ \frac{10x-10(x+h) }{ x(x+h )} \times \frac{1}{h}} \] now distribute 10(x+h) multiply x(x+h)
Destinyyyy
  • Destinyyyy
Okay
Destinyyyy
  • Destinyyyy
-10h/ x^2+x * 1/h
Destinyyyy
  • Destinyyyy
-10h/ x^2+xh
Nnesha
  • Nnesha
hmm there is a mistake in the denominator
Nnesha
  • Nnesha
\[\huge\rm \frac{ -10h }{ x(x+h) \times h }\] distribute x+h by x
Destinyyyy
  • Destinyyyy
xh^2 +xh^2
Destinyyyy
  • Destinyyyy
Right or no?
Nnesha
  • Nnesha
yes right h is common factor we take it out \[\huge\rm \frac{ -10h }{ h(x^2+xh) }\]now simplify
Destinyyyy
  • Destinyyyy
-10/ x^2+h
Nnesha
  • Nnesha
hmm
Nnesha
  • Nnesha
\[\huge\rm \frac{ -10\cancel{h} }{ \cancel{h}(x^2+xh) }\] so final answer would be what ?
Destinyyyy
  • Destinyyyy
-10/ x^2 +xh .. I noticed I forgot the second x
Nnesha
  • Nnesha
yes right
Destinyyyy
  • Destinyyyy
Okay.. For the next one with the square root I have nothing.. I wasnt sure where to start
Destinyyyy
  • Destinyyyy
I can put it in a new question if youd like
Nnesha
  • Nnesha
which one ?
Destinyyyy
  • Destinyyyy
Ill tag you on it..
Nnesha
  • Nnesha
alright

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