book Maths Puzzle Numerical Ability

use the discriminant to determine how many real number solutions the quadratic equation -4j^2+3j-28=0 has

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book Other Question

solve the equation: |0.1x - 0.2| = |0.2x - 0.4| Hi. My problem is:

How many planes are determined by four points, no three of which are collinear?

Thanks a lot!