exam Maths Puzzle Numerical Ability

Write 3 quadratic equations with a,b,c (co-efficients of x2. X, and the constant) as
1. Integers:
2. Rational numbers:
3. Irrational numbers:

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exam Other Question

How many liters of water must be added to 50 liters of a 30% acid solution in order to produce a 20% acid solution? for what value(s) of p does the equation x^2+px+1=0 have no real solutions, and two real solutions.