P and Q are the subsets of a universal set U. If U = {x:x is a whole number, x<9}, P= {y:y is a multipe of 2} and Q= {z:z is a factor of 12}, verify that P n Q (complement) = P U Q (complement).

PnQ={2,4,6,12} this is correct

PUQ={1,2,3,4,6,8,10,12,14,16,18,20} this may be right

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.

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