How do you factor this completly


I am confused by the different power of exponets and the 7x in front Can you please help me?

7x*(4x-5)^3+(4x-5)^4 factor out the common term:
(4x-5)^3 * (7x+4x-5) Then simplify the second term.

what general equation will model this problem, with a focus of 1.8, points at (1.8,5) and (1.8,-5).with the center in the orgin.

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