Book Maths Puzzle Algebra

How do I factor these trinomials? 18d^2-54d+28 and n^2+26n+25=0
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hi i was wondering how you know what you are tyring to find the answer of for example i was working the problem a2-10a+25=0 and i thought i was supposed to find the two points whi Solve 5^3x= 3^(x+4) for x.