book Maths Puzzle Numerical Ability

Find the sum of the infinite geometric series 36 + 24 + 16 +... if it exists

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book Other Question

3+[2x-9]-20 Show EACH step in solving each of the following equations. Show which method (factoring, square root method, completing the square, or quadratic formula) you used to solve it and tell why.
a: (x + 2)^2 = 8