Which of the following expressions represents “7 less than a number is 18”? 1.)none of the choices are correct. 2.) x - 7 = 18 3. )18 – x = 7 4. )-7x = 18 5. )7 – x = 18

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i