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Solving quadratic equations

Free Printable Solving quadratic equations PDF Worksheets, Revision Guide & GCSE Past Paper Questions (Grade 5)

Download free solving quadratic equations worksheets (PDF), GCSE maths past paper questions and worked solutions for Solving quadratic equations (5H). This is a Grade 5 algebra topic from the GCSE questions by topic collection for Foundation and Higher tier crossover GCSE Maths (Edexcel, AQA, OCR and IGCSE).

The free PDF worksheets table below brings together printable question booklets (Qs) and worked answers or mark schemes (Ans) from Maths Genie, Maths4Everyone, Corbett Maths, Maths Made Easy, Dr Frost, Naiker Maths, Dr Austin, E Classroom and PMT, along with past paper question booklets.

Below the worksheet links you can read our solving quadratic equations revision notes and worked examples with diagrams, try real GCSE past paper solving quadratic equations questions with step-by-step solutions, or download a PDF of all solving quadratic equations worksheet links.

Free Solving quadratic equations PDF Worksheets & Answers

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GCSE Maths Grade 5 Revision Notes & Method

Guide to Solving quadratic equations: Explanation, Diagrams & Worked Examples

Download Printable One Page Guide (PDF)

Explanation:

To solve a quadratic equation by factorising, first rearrange the equation so that one side equals zero (ax2 + bx + c = 0). Never factorise while there is a non-zero number on the right-hand side.

Factorise the quadratic expression into two brackets, then set each bracket equal to 0 and solve for x (because if two brackets multiply to give 0, at least one bracket must equal 0). Notice that the signs of the roots are opposite to the signs in the brackets.

Example 1: Solve x2 − 8x + 15 = 0.

Solution:

Multiply to +15 and add to −8 → −3 and −5
Factorise: (x − 3)(x − 5) = 0
Either x − 3 = 0 or x − 5 = 0
Answer: x = 3 or x = 5

Example 2: Solve x2 + 3x = 18.

Solution:

Rearrange to equal 0: x2 + 3x − 18 = 0
Multiply to −18, add to +3 → +6 and −3
Factorise: (x + 6)(x − 3) = 0
x + 6 = 0 → x = −6; x − 3 = 0 → x = 3
Answer: x = −6 or x = 3
Scanned GCSE Exam Questions & Worked Solutions

GCSE Past Paper Solving quadratic equations Questions & Answers

Past Paper Example 1 AQA Jun 2025 1F Q26 / 1H Q10 4 marks
Not drawnaccurately(x + 2) cm(x – 5) cm
Rectangle with sides (x + 2) cm and (x – 5) cm has area 120 cm². Work out x. [4 marks]
The area of the rectangle is 120 cm2
Work out the value of x.
Worked Solution & Mark Scheme (4 marks)
(The area of a rectangle is length × width)
(x + 2)(x – 5) = 120 ⇒ x² – 3x – 10 = 120 ⇒ x² – 3x – 130 = 0. M3
Factorise: (x – 13)(x + 10) = 0 ⇒ x = 13 (length > 0). A1
Answer: x = 13
Past Paper Example 2 GCSE Nov 2021 1H Q8 3 marks
Solve x2 = 5x + 24
Worked Solution & Mark Scheme (3 marks)
x² – 5x – 24 = 0 M1
⇒ (x – 8)(x + 3) = 0 M1
⇒ x = 8 or x = –3 A1
Answer: x = 8 and x = -3
Past Paper Example 3 GCSE Nov 2024 1F Q26 3 marks
Solve x2 - 2x - 15 = 0
Worked Solution & Mark Scheme (3 marks)
(x – 5)(x + 3) = 0 M2
⇒ x = 5 or x = –3 A1
Answer: x = 5, x = –3

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