Respuesta :

Viajj

Answer:

a. 4(a+5)(a-5)

d. (2d+9)(2d+9)

Step-by-step explanation:

hope these help i couldnt understand b and c

* the point is in the difference between (a+b)(a+b) and (a+b)(a-b)

in the former you have a2+2ab+b2 the latter is just a2-b2

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