exam Maths Puzzle Numerical Ability

I need help solving this exponential equation

5x2-3x=625

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exam Other Question

True or false, the following polar coordinates are multiple representations of the same point: (-5, 7pi/4)(-5, 5pi/4)

i say false but i really dont know....i also dont know if this should be posted somewhere else Which is the factored form for x to the second power minus 7x plus 10?
a.(x+5)(x-2)
b.(x-5)(x+2)
c.(x-5)(x-2)
d.(x+5)(x+2)