This exam tips covers Common Mistakes to Avoid 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 7 of 8 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Common Mistakes to Avoid
- WRONG: Forgetting the negative in front of b → writing b instead of -b
- WRONG: Writing -b² instead of (-b)² when b is negative (Use brackets!)
- WRONG: Forgetting to divide the WHOLE top by 2a
- RIGHT: Calculate b² - 4ac separately first, then substitute
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