exam Maths Puzzle Numerical Ability

For the following equations I am coming up with no real number solutions for either of them. Am I missing something?

x^2 = -100

5x^2 = -125

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exam Other Question

Find the slope of any line parallel to the line through points (19, 11) and (9, 9). Hi.

What is the least common denominator of the following set:

1/(a+1)^2, 1/(a-1)^2, and 2/a^2-1

Thanks for your help!