exam Maths Puzzle Numerical Ability

what is the sum of the roots of the quadratic equation: ax^2 + bx + c = 0, where a, b, and c are all non-zero real constants

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exam Other Question

x + y = 12
y = 2x
HELP One third of the result of twice a certain number is added to one. The resulting expression is equivalent to one quarter of twice the certain number. Write an equation and solve.