Respuesta :

sandraulochi

Answer:

9x^2+ x - 81

Step-by-step explanation:

[tex]( - {9}^{2} - 2x) - ( - 9 {x}^{2} - 3x) \\ ( - 81 - 2x) + 9 {x}^{2} + 3x \\ - 81 - 2x \: + 9 {x}^{2} + 3x \\ - 81 + x + 9 {x}^{2} \\ 9 {x}^{2} + x - 81[/tex]

hope this helps

Heather

Answer: [tex]9x^2 +x-81[/tex]

Step-by-step explanation:

Given:

  (-9^2-2x) - (-9x^2-3x)

Rewrite using LaTeX:

  [tex](-9^2-2x) - (-9x^2-3x)[/tex]

  Distribute the negative:

[tex]-9^2-2x + 9x^2 +3x[/tex]

  Combine like terms:

[tex]-9^2 + 9x^2 +x[/tex]

  Exponent:

[tex]-81 + 9x^2 +x[/tex]

  Reorder:

[tex]9x^2 +x-81[/tex]

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