The function f is defined by f:x = 2x^2−12x+13 for 0≤x≤A,where A is a constant.

i) State the value of A for which the graph of y = f(x) has a line of symmetry.
ii) When A has this value, find the range of f.

Question

The function f is defined by f:x = 2x^2−12x+13 for 0≤x≤A,where A is a constant. 

i) State the value of A for which the graph of y = f(x) has a line of symmetry. 
ii) When A has this value, find the range of f.

lxelle · Answer

Why is the A so high up?

lxelle · Answer

Supposedly A =6

lxelle · Answer

Please explain more.

lxelle · Answer

Anyways, I got it already. What about the next ques?

lxelle · Answer

Substitue 6 into the equation. Hence 13 right? and -5 comes from the a(x+b)2+c equation right?

lxelle · Answer

Okok. Thanks. I grasp it already. Your explanation is too lengthy.