If f(x) = 4х2 + 1 and g(x) = х2 - 5, find (f+ g)(x).
оа. 5х2 - 6
ов. 3х2 - 4
ос. 5х2 – 4
od. 3х2 +6

4 x 2 + 1 = 9 + х2 - 5

8 + 1 + x2 - 5

9 + x2 - 5

x11 - 5

x6

Step-by-step explanation:

or

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