exam Maths Puzzle Numerical Ability

solve by completing the square
4x^2 + 2x - 3 = 0

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exam Other Question

Find an equation of the line containing the given pair of points
(1/4, -1/2) and (3/4, 6)
If the probability that at least one person makes an A on the final exam is 0.15, what is the probability no one makes an A?