Question

Find the vertex, the symmetry, and the maximum or minimum value of the quadratic. And graph. f(x)=3x^2-12x+21

Answer 1

Mnimum because coefficient of x^2 is +ve

Answer 2

Complete the square
3x^2-12x+21
3(x^2-4x)+21
3(x-2)^2-4(3)+21
3(x-2)^2+9

Vertex at (2,9)
symmetry at x=2

Answer 3

Thank you...