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
(5+x)+12
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