exam Maths Puzzle Numerical Ability

find the exact solutions to 5x^2+17x+6=0

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exam Other Question

please help with this,

Find ALL solutions of the equation. I need to show all possible solutions. thanks

9x^4 - 24x^3 + 16x^2 = 0

thanks
A certain radioactive element decays exponentially with a half-life of 5 hours. Find the time that has elapsed if a 50mg sample has decayed to 17 mg.