Solve for x in the equation x squared minus 4 x minus 9 = 29. x = 2 plus-or-minus startroot 42 endroot x = 2 plus-or-minus startroot 33 endroot x = 2 plus-or-minus startroot 34 endroot x = 4 plus-or-minus startroot 42 endroot

The correct answer is A. x = 2 +/- √42

Step-by-step explanation:

Let's solve for x the quadratic equation, this way:

x² - 4x - 9 = 29

x² - 4x - 38 = 0

Using the quadratic formula, we have:

x = [- (-4) +/- √ -4² - 4 * -38]/2

x = 4 +/- √ 16 + 152/2

x = 4 +/- √ 168/2

x = 4 +/- √ 4 * 42/2

x = 4 +/- 2 √42/2

x = 2 +/- √42

The correct answer is A. x = 2 +/- √42

45

step-by-step explanation:

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