Why complete the square instead of using the formula?

It gives the turning point directly, and it keeps exact surd solutions without a calculator. The formula is better when you only need decimal roots.

How do I find the turning point from completed square form?

For (x + p)² + q the turning point is (−p, q). The sign of p flips.

Is completing the square Higher only?

Yes. It is a Higher algebra technique, including reading a minimum or maximum from the rewritten form.

Completing the square GCSE Maths questions

Completing the square GCSE Maths questionsCompleting the square GCSE Maths questions: write x² + bx + c as (x + p)² + q and read the turning point. Higher algebra practice with instant marking.Start free GCSE Maths test · Pricing