Solve for x in the equation x squared minus 4 x minus 9 is equal to 29

Move 29 to the left side: x² − 4x − 38 = 0. Using the quadratic formula gives x = (4 ± √(16 + 152))/2 = (4 ± √168)/2 = 2 ± √42, so the solutions are “2 plus or minus square root of 42,” choice C.

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