Khianna went shopping for her outfit for a dance at the school. she planned to buy shoes, jewelry, nail polish, makeup, and a dress at the mall. at one store she bought nail polish for $4.79 and makeup for $21.45. at another store she bought shoes for $26.43. at a third store she bought her dress for $168.27. she calculated that she spent $389.21. is this reasonable? why or why not?

g

step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15