x²- 6x - 7 = 0
'a' already = 1 so we go straight to the next step
ignore the '-7' and put the x²- 6x into brackets
(x - 3)²= 0
expand this out
(x - 3)(x - 3) = 0 x²- 3x - 3x + 9 = 0
simplify
x²- 6x + 9 =0
find the diffrence between this and the original
x² - 6x + 9 - x²- 6x -7 = -16
So to compleate the square we write (x - 3)²- 16 = 0
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