book Maths Puzzle Numerical Ability

(1) Find the x- intercepts of the graph of f(x) =2x^2-4x-4

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book Other Question

Simplify. Write each expression as a power and as a radical
X*X/ A QDA instructor gave a class two tests. 25% of the class passed both tests and 42% passed the first test. What percentage of those who passed the first test also passed the second test?