Jamal is buying ingredients to make a large batch of granola to sell at a school fair. He buys 3.8 pounds of walnuts for $4.61 per pound and 2.4 pounds of cashews for $6.23 per pound. How much change will he receive if he pays with two $20 bills?He will receive $back.

Walnuts = 3.8 × $4.61 = $17.52

Cshews = 2.4 × $6.23 = $14.95

$17.52 + $14.95 = $32.47

$40 - $32.47 = $7.53

So he will receive back $7.53

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