1. ## i cant do this one quadratic question!

Express y=ax^2+4x+2a in the form y=a(x+b)^2+c in terms of a.

usually when i do these sorts of questions i dont complete the square, i find the axis of symmetry and then find the turning point and put it into the equation.
But in this case im lost because i cant remember how to complete the square!

2. Originally Posted by Kash
Express y=ax^2+4x+2a in the form y=a(x+b)^2+c in terms of a.

usually when i do these sorts of questions i dont complete the square, i find the axis of symmetry and then find the turning point and put it into the equation.
But in this case im lost because i cant remember how to complete the square!
$\displaystyle = a \left( x^2 + \frac{4}{a} x + 2 \right)$.

Now complete the square of the quadratic inside the brackets.

3. Originally Posted by Kash
im lost because i cant remember how to complete the square!
For lessons with worked examples, try here.