book Maths Puzzle Numerical Ability

All solutions are real numbers

5n^2=-12n-1

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book Other Question

What is the formula for the area of a trapezoid? Sorry but I forgot to add something!

{{{ 0.419 = 1sqrt(1-(v^2/c^2)) }}}

c is known to be the speed of light in a vacuum: 3.00E8
need to find the value of v.

Thank you.