exam Maths Puzzle Numerical Ability

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

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exam Other Question

3 radical 25 over 4 if 3/5 is added to twice the reciprical of a number, the result is 1. find the number