How do I solve a quadratic equation by competing the square?

How would you solve  x2+8x+16=81Show that this can be factorised (x+4)2=92Which can then be easily solved by square rooting both sides
What if we could now use this method to solve all quadratics?!!?
Consider Solve  x2+6x+1=0
We can complete the square by:(x+3)2-9+1=0 (x+3)2-8=0 (x+3)2=8 (x+3)=±√8 x=-3±2√2

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How would you solve a quadratic equation by factorising?


What is (2/3)^(-1/3)?


v^2=u^2+2as, make "a" the subject of the formula.


Factorise 2c2 + 8c + 8.


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