This deep dive covers Method: Using the Quadratic Formula within Quadratic Formula for GCSE Mathematics. Revise Quadratic Formula in Algebra for GCSE Mathematics with 11 exam-style questions and 5 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 3 of 8 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Method: Using the Quadratic Formula
1
Write the equation in form ax² + bx + c = 0
2
Identify a, b, and c (watch for negatives!)
3
Substitute into the formula carefully
4
Calculate b² - 4ac first (the discriminant)
5
Work out x using + then using -
Practice questions for Quadratic Formula
For the equation 3x² − 5x + 2 = 0, what are the values of a, b, and c in the quadratic formula?
Explain what the value of the discriminant (b² − 4ac) tells you about the solutions to a quadratic equation.
Quick recall flashcards
Quadratic Formula
x = (-b ± √(b²-4ac))/2a for ax² + bx + c = 0
The Quadratic Formula
x = (-b ± √(b² - 4ac)) / 2a