Completing the Square (Edexcel GCSE Maths): Quizzes

$(x + p)^2 + q$

Divide it by 2

Forgetting the adjusting number in Step 4

$(x + 4)^2$

$(x + 4)^2 - 11$

$a = 1$

Taking the square root

$x = -4 \pm \sqrt{11}$

$c - (\frac{b}{2})^2$

When the quadratic doesn't factorise

To make the expression equal the original

Its vertex