Intervention
What will happen to a test dummy during a crash test if its seatbelt is not buckled?
The test dummy will stop when the car stops
The test dummy will continue forward until it makes contact with another object
The test dummy will strike and rebound continuously within the interior of the car
The test dummy will remain motionless

The test dummy will continue forward until it makes contact with another object.

Step-by-step explanation:

let's call the solutions x₁ = (5 - 2√7)/3 and x₂ = (5 + 2√7)/3

then the equation is (x-x₁)(x-x₂) = 0

if you fill that in you get a lot of numbers which you can recognize as ax²+bx+c=0.

step-by-step explanation:

you can see that a=1 (there is just an x²)

b = (-5 -2√7 + 2√7 - 5)/3 = -10/3

c = -2√7)/3 ) * (-5+2√7)/3) = -1/3

so your answer is 3x^2 – 10x – 1 = 0