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 ▸Factorise this quadratic = 8x^2 + 2x -3
How do you solve simultaneous equations?
Solve x^2 - 5x - 14 = 0
Sophie had 3 piles of coins, A, B and C. Altogether there was £72. Pile B had twice as much as pile A. Pile C had three times as much as pile B. How much money was in Pile C?