Respuesta :

Answer:

49x²+126x+81

Step-by-step explanation:

Area of any square is length²

If the length given is 7x+9, we can square this to find out what represents the area:

[tex](7x+9)^{2}[/tex]

[tex](7x+9)(7x+9)[/tex]

[tex]49x^{2} +63x+63x+81[/tex]

[tex]49x^{2} +126x+81[/tex]

thenewoldpanhavuth

Answer:

49x² + 126x + 81

Step-by-step explanation:

A = a²

Since a = 7x + 9

=> A = (7x+9)²

= 49x² + 126x + 81

Note: (a+b)² = a² + 2ab + b²

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