Question

Find the vertex and axis of symmetry of the graph of the function: f(x)=2x^2+8x

Answer 1

Put the equation into this form: f(x)=2(x^2+4x)
Then complete the square.

Answer 2

how do u complete the square?

Answer 3

Take half the coefficient of x and square it.

Answer 4

y+4=2x^+4x+4

Answer 5

y+8=2(x^2+4x+4)

Answer 6

so i solve that to find the vertex?

Answer 7

Put it into this form: y=(x-h)^2+k
(h,k) is the vertex