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GRE
GRE Quantitative Reasoning Section

Finding the value of c for exactly one solution for f(x)

Very Hard Algebra Functions

Let the function $$f(x)$$ be defined by the equation:

$$f(x) = 5x^2 + 4x - 1$$

For what value of $$c$$ does the following equation have exactly one solution?

$$f(x) = c$$

Hint

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