Question

(x-9)(9+x )expand using suitable identity​

Answer 1

(x-9)(9+x)

x(9+x)-9(9+x)

9x+x^2-81-9x

x^2=81

x=9

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Answer 2

Step-by-step explanation:

$(x - 9)(x + 9) \\ as \: we \: know \: that \: (x - y)(x + y) = {x}^{2} - {y}^{2} \\ by \: u sing \:this \: identity \: we \: get \\ = > {x}^{2} - {9}^{2} \\ = > {x}^{2} - 81 \\ ans$