exam Maths Puzzle Numerical Ability

I cannot figure out how to solve this quadratic equation.
Solve for x:

2x^2 + 3bx + b^2 = 0

Thank you,
Melody Salzer

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exam Other Question

state the number to replace ? a + 3a= 1a = 3a = (1 + ?) a

Distributive property

Thank you Find all numbers for which the rational expression is undefined. Simplify your answer. Use an integer or a fraction. Use a comma to separate answers as needed.