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
Related Maths GCSE answers
All answers ▸A metal sphere of radius 15cm is melted down and recast into a solid cylinder of radius 6cm. Calculate the height of the cylinder.
Prove algebraically that the difference between the squares of any two consecutive odd numbers is always a multiple of 8
How do I solve a simple simultaneous equation?
When will I use this in my everyday life?