exam Maths Puzzle Numerical Ability

Can I have some help with a study guide question by solving the equation 3x^2-4x+5=0 by completing the square?

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exam Other Question

find the accumulated value of an investment of $8,000 at 9% compounded continuously for 4 years. Are these two lines perpendicular?
Line 1: y=x+3
Line 2: x-y=13