0580/23 May/Jun 2023, Question 19: The Quadratic Formula and Completing the Square
Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Calculator · 4 marks
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The question, in short
Solve x² + 5x − 7 = 0, showing all working, with answers given to 2 decimal places.
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Solution · 4 marks
- 1x = (−5 ± √(5² − 4 × 1 × (−7)))/(2 × 1)
- 2= (−5 ± √53)/2
- 3= (−5 ± 7.2801…)/2
- 4x = 1.14 or x = −6.14
Answer−6.14 and 1.14
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