Question

what should be added i have answer but it is seeming wrong can someone hlp​

Answer 1

Step-by-step explanation:

let A +9x^4-11x^2+6=13x^3+6x^2-11x-14

A= 13x^3+6x^2-11x-14-9x^4+11x^2-6=13x^3+17x^2-9x^4-20

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