exam Maths Puzzle Numerical Ability

3 radical 25 over 4

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Need help with this. Thanks!

A woman deposits $50,000 in a savings account with 4% continuously compound interest. How many years must she wait until the balance has doubled?
solve the equation show all work
x^2 - 3x = 10
x^2 - 3x + 10 = 0
x(x-3 + 10) = 0
I have no idea how to finish this problem