book Maths Puzzle Numerical Ability

Solve by completing the square:

w^2 - 2w- 15 = 0

Solve
x^2 + 2x - 8 < or = to 0

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book Other Question

please sketch 6 points, U, V, W, X, Y and Z on four lines such that each line contains 3 points. how many lines are concurrent at each point? Please hurry. thank you for your he I am wondering if you would know how to solve the problem 2 ln x = 1