exam Maths Puzzle Numerical Ability

Simplify the expression
15x^2 - x - 2
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3x^2 - 5x - 2

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exam Other Question

Place the following set of numbers in ascending order.

-2/5, 1/6, 7/8, -5/9, 3/4
Please help with this. -5/9, -2/5, 1/6, 3/4, 7/8 ? Am I even at all close to being right? Use the quadratic formula to solve the following equations

2x^2 - (/7)x - 1 = 0