For the given equation of parabola, you can find the vertex by completing the square in the form
where (h, k) is vertex.
If, suppose equation of a parabola is
Then, complete the square, so, eqn becomes,
so, vertex = (1, 2)
so, turning point = (1, 2)
Did you get it now???
Shyam - no, I'm afraid that just confuses me even more.
I think my lecturer gave the formula: -b/2a to find the x-component of the vertex, then may have said to substitute that value into another equation to find the y-component.
Does this sound right or am I way off?
sub -3 into the function to get the value of y
therefore, the vertex for this example is (-3,-1)
Shyam is simply using another method then the one you are instructed to use