Which function is a quadratic function? t(x) = (x-4)2 + 3
g(x) = (2x + 4) + 3
r(x) = -x - 414 + 3(x + 2)2
s(x) = {X-6) + 3(x + 1)

Explanation:

This is a 45-45-90 triangle. The legs are both the same (both 5) and the hypotenuse is in the form x*sqrt(2) where x = 5 is the length of each leg. You can use the pythagorean theorem to solve for b as shown below

a^2 + b^2 = c^2

5^2 + b^2 = (5*sqrt(2))^2

25 + b^2 = 50

b^2 = 50-25

b^2 = 25

b = sqrt(25)

b = 5

So this proves the two legs a = 5 and b = 5 are the same. This is an isosceles right triangle.