The cost of 3 boxes of envelopes and 4 boxes of note-cards is $19.50 Two boxes of envelopes and 6 boxes of note-cards cost $23.00 . Find the cost of each box of envelopes and each box of notecards

sine

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

the answer will be -6x^2 +46

step-by-step explanation: