Posted by **toni** on Tuesday, October 8, 2013 at 9:54am.

Im lost i don't know how to do this can someone show me step by step how to solve this

For what value does c does the equation have one real root? Hint using the values of a and b found in the equation, solve D = 0 for c.

Consider the quadratic expression X^2 + 4x + c = 0.

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