This exam tips covers Common Mistakes to Avoid within Solving Quadratics for GCSE Mathematics. Revise Solving Quadratics in Algebra for GCSE Mathematics with 15 exam-style questions and 12 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. 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.
Topic position
Section 7 of 8
Practice
15 questions
Recall
12 flashcards
Common Mistakes to Avoid
- WRONG: x² + 5x + 6 = 0 → x = 2 or x = 3 (Forgot the NEGATIVE signs!)
- WRONG: Only writing one answer (Quadratics usually have TWO solutions)
- WRONG: Solving x² + 5x + 6 = 12 by factorising directly (Must rearrange to = 0 first!)
- RIGHT: Always check by substituting BOTH answers back into the original
Keep building this topic
Read this section alongside the surrounding pages in Solving Quadratics. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Solving Quadratics
The equation x² + 5x + 10 = 0 has:
A rectangle has length (x + 5) cm and width (x + 2) cm. The area of the rectangle is 40 cm². Form a quadratic equation and solve it to find the value of x.
Quick Recall Flashcards
15 questions on Solving Quadratics — practise free
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