exam Maths Puzzle Numerical Ability

what is the answer step by step to the following quadratic equations ?

x squared-4x-15=0
x squared+8x-33=0
x squared+5x+2=0
3xsquared-3x+6=0
Help would be great i need it bad

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exam Other Question

ive been havgin hard time trying to solve this equation, i dont know how to.

V - 1.58 = 2.76

thanks! =) Suppose that $2000 is invested at a rate of 6% per year compounded continuously. What is the balance after 1 year? After 2 years?