Solve for x.
4
15
6
X
x = [?]
Enter the number in decimal form

66

Step-by-step explanation:

x / 6 + 4 = 15

To find x ;

Subtrac4 from both sides

x / 6 + 4 - 4 = 15 - 4

x / 6 = 11

Multiply both sides by 6

x / 6 * 6 = 11 * 6

x = 66

Value of x = 66

To see, we should use the quadratic formula:

(-b +/- sqrt (b - 4ac))/2a

We plug the values in:

(-(-4) +/- sqrt (-4 - 4 * 3 * 5))/(2 * 3)

(4 +/- sqrt (-64))/6

But, we can’t have a negative square root, so we use i for imaginary.

That means that we will have imaginary roots, so the answer is (D).