exam Maths Puzzle Numerical Ability

How to show that the equation x^2 + px -q^2 = 0 are real for any real numbers p & q? Thanks

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exam Other Question

The speed of train A is 12 km/h slower than the speed of train B. Train A travels 230 km in the same time it takes train B to travel 290 km. Find the speed of each. Graph the following linear equation:

y=-2x-1

Any help with this one would be great. Thank you so much.