Answer:
16x^2 -36 does factorise
x^2 -6x +36 don't factorise
x^2 -4x +4 does factorise as (x−2)(x−2)
36x^2 +108x +819 does factorise as (2x+3)(2x+3)
25x^2 +30x +36 don't factorise
Hope this helps!
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