The diagrams belowe, not drawn to Selet scale, shouts a wooden prism with cross section A B C D E F
is the mopoint of Ec, and <BAE =<CBA =
tay in the Shape of a
90°
sem
E E
F
А
6cm
10cm
Calculate
). The length of EF​

7 is the median   7.875 is the mean

step-by-step explanation:

3,4,5,6,8,11,13,13

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