Brenda is buying 6 concert tickets online. Each ticket costs $15, plus a service fee of x dollars. Write the function () that shows the total amount that Brenda will pay for the tickets.

F(x) = 90 + x

Step-by-step explanation:

Giveb that :

Number of tickets = 6

Cost per ticket = $15

Service fee = $x

Total amount Brenda paid :

Cost of 6 tickets = (15 * 6) = $90 + service charge

F(x) = cost function

F(x) = 90 + x

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