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Question Number 121612 by Khalmohmmad last updated on 10/Nov/20

Commented by MJS_new last updated on 10/Nov/20

the problem why you got no answer might  be that nobody knows what “the (a_4 =?)”  means. your question is like this one:  the ship is 25m long. how old is Peter?

$$\mathrm{the}\:\mathrm{problem}\:\mathrm{why}\:\mathrm{you}\:\mathrm{got}\:\mathrm{no}\:\mathrm{answer}\:\mathrm{might} \\ $$$$\mathrm{be}\:\mathrm{that}\:\mathrm{nobody}\:\mathrm{knows}\:\mathrm{what}\:``\mathrm{the}\:\left({a}_{\mathrm{4}} =?\right)'' \\ $$$$\mathrm{means}.\:\mathrm{your}\:\mathrm{question}\:\mathrm{is}\:\mathrm{like}\:\mathrm{this}\:\mathrm{one}: \\ $$$${the}\:{ship}\:{is}\:\mathrm{25}{m}\:{long}.\:{how}\:{old}\:{is}\:{Peter}? \\ $$

Commented by Study last updated on 10/Nov/20

for example  p(x)=3x^2 +4x^3 −2  a_2 =2  ,  a_3 =4 ,   a_0 =−2

$${for}\:{example}\:\:{p}\left({x}\right)=\mathrm{3}{x}^{\mathrm{2}} +\mathrm{4}{x}^{\mathrm{3}} −\mathrm{2} \\ $$$${a}_{\mathrm{2}} =\mathrm{2}\:\:,\:\:{a}_{\mathrm{3}} =\mathrm{4}\:,\:\:\:{a}_{\mathrm{0}} =−\mathrm{2}\: \\ $$

Commented by MJS_new last updated on 10/Nov/20

no. you′d have to define a_n  first. i.e.  a_n =p(n) with p(x)=3x^2 +4x^3 −2  then it′s clear.  but a_n =p(x, y) ???

$$\mathrm{no}.\:\mathrm{you}'\mathrm{d}\:\mathrm{have}\:\mathrm{to}\:\mathrm{define}\:{a}_{{n}} \:\mathrm{first}.\:\mathrm{i}.\mathrm{e}. \\ $$$${a}_{{n}} ={p}\left({n}\right)\:\mathrm{with}\:{p}\left({x}\right)=\mathrm{3}{x}^{\mathrm{2}} +\mathrm{4}{x}^{\mathrm{3}} −\mathrm{2} \\ $$$$\mathrm{then}\:\mathrm{it}'\mathrm{s}\:\mathrm{clear}. \\ $$$$\mathrm{but}\:{a}_{{n}} ={p}\left({x},\:{y}\right)\:??? \\ $$

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