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For what values of n does the equation 2x2 + nx + 9 = 0 have exactly one root? Homework Help ✎

This equation can be solved using the Quadratic Formula.
When does the Quadratic Formula yield exactly one solution/root?

The Quadratic Formula yields exactly one solution when the value inside the square root is zero.

b2 − 4ac = 0 or in this case, n2 − 4(2)(9) = 0.
Solve for n.