What is the quadratic formula?

x = (−b ± √(b² − 4ac)) / (2a) for ax² + bx + c = 0. The whole numerator is divided by 2a.

Do I have to use the formula if it factorises?

No. Factorising is exact and usually shorter. Use the formula when the numbers do not factor nicely or the question names it.

Is the quadratic formula on Foundation?

Solving quadratics by factorising can appear on Foundation. The formula itself is Higher.

Quadratic formula GCSE Maths questions

Quadratic formula GCSE Maths questionsQuadratic formula GCSE Maths questions: identify a, b and c, keep the discriminant inside the square root, and round only at the end. Higher algebra with marking.Start free GCSE Maths test · Pricing