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Math Help - i cant do this one quadratic question!

  1. #1
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    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!
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  2. #2
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    Quote Originally Posted by Kash View Post
    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!
    = a \left( x^2 + \frac{4}{a} x + 2 \right).

    Now complete the square of the quadratic inside the brackets.
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  3. #3
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    Quote Originally Posted by Kash View Post
    im lost because i cant remember how to complete the square!
    For lessons with worked examples, try here.
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