Question

Find the vertex of the quadratic equation: y = 2x2 + 8x − 4.

Answer 1

divide by two to get all that junk out

Answer 2

x=-1
y =-4

Answer 3

You can use calculus:
\[f(x)=2x^2+8x-4\]\[f'(x)=4x+8=0\]\[x=-2\]\[f(-2)=y=-12\]

Answer 4

vertex = -b/2a where y=ax^2 + bx + c, so in this case: x=-8/2(2) = -2

Answer 5

thank you!

Answer 6

another way would be to use\[(x-h)^2=4p(y-k)\]