Question

what must be added to x^3-2x+5 to get 2x^3+x^2-3

Answer 1

( x^3-2x+5 ) + ?=2x^3+x^2-3

?=2x^3+x^2-3 - ( x^3-2x+5 )

 =2x^3+x^2-3- x^3+2x-5

=2x^3- x^3+x^2+2x-5-3

= x^3+x^2+2x-8

answer : $x^3+x^2+2x-8$

Answer 2

Hey
Here is your answer
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let us consider the number be (a)

Now,
$( {x}^{3} - 2x + 5) + a = {2x}^{3} + {x}^{2} - 3 \\ a = {2x}^{3} + {x}^{2} - 3 - ( {x}^{3} - {2x}^{} + 5) \\ a = {2x}^{3} + {x}^{2} - 3 - {x}^{3} + 2x - 5 \\ a= {x}^{3} + {x}^{2} + 2x - 8$
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answer is: x^3+x^2+2x-8

thanks