1) (9/152)x^2 + 21.375 = 0(9/152)x^2 = -21.375x^2 = (-21.375) (152/9)x^2 = -21.375 16.8889x^2 = -360.03x = ±√(-360.03)x = ± 18.99i
2) 45x^2 + 405 = 045x^2 = -405x^2 = -405 / 45x^2 = -9x = ±√(-9)x = ±3i
3) x^2 - 24x - 120 = 0(x - 30)(x + 6) = 0x = 30 or x = -6
1) (9/152)x^2 + 21.375 = 0
(9/152)x^2 = -21.375
x^2 = (-21.375) (152/9)
x^2 = -21.375 16.8889
x^2 = -360.03
x = ±√(-360.03)
x = ± 18.99i
2) 45x^2 + 405 = 0
45x^2 = -405
x^2 = -405 / 45
x^2 = -9
x = ±√(-9)
x = ±3i
3) x^2 - 24x - 120 = 0
(x - 30)(x + 6) = 0
x = 30 or x = -6