book Maths Puzzle Numerical Ability

3x2 +x -2 =0

I only need to solve this using QF and don't need to find the discriminant.

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book Other Question

solve:

20 over x = 20 over x-4 + 4 over x

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How do you find the variable in the equation below?

1095600 = x + (y + 0.04)