Evaluate 2(x-4) + 3x - x2 for x = 3.
o
a. -6
o
b. 2
a
o c. 6
od. -2

D.  -2.

Step-by-step explanation:

2(x-4) + 3x - x2 for x = 3

= 2(3-4) + 3(3) - 3^2

= 2(-1) + 9 - 9

= -2 + 9 - 9

= -2.

the answer is a.

135 and 80

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