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How do you complete the square on this question? watch

    • Thread Starter
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    Write y=2x^2 -5x +10 in the form
    y=a(x+b)^2 + c
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    tip: put the rest of the equation into a bracket with 2 outside and try and solve from there
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    Your coefficient for your ‘a’ value will be placed outside the brackets. From here try to factorise in the form it asks it to be given in
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    Or just expand the completed square form to get y=ax^2+2abx+ab^2+c and compare with y=2x^2-5x+10 to obtain the values of a,b,c
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    first step:
    2(x^2-5/2x)+10
    second step:
    2(x^2-5/2x +5/4^2 -5/4^2) +10
    third step:
    2[(x-5/4)^2 -5/4^2]+10
    fourth step:
    2(x-5/4)^2 +13.125
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