Book Maths Puzzle Algebra

2/x^2-1=2/x

I have a few more I need help on. Seeing the steps would help me figure out where I am going wrong.

n=81jk^2 for k

solve the next one by completing the square

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Book Other Question

A 13-foot ladder is resting at an angle against a building. The distance from the bottom of the ladder to the edge of the building is 7 feet less than the distance from the top of the ladder down to the ground. What is the height at which the ladder touches the building and what is the distance from the bottom of the ladder to the building?? 4x-y=-27 graph it