NumericalHard4 marks
Solve the following quadratic equation : x² + 4x - 8 = 0. Give your answer correct to one decimal place.
Topic: Quadratic equations
Previous-year question practice database
Answer
Exam answer
x = 1.5 or x = −5.5 (to 1 decimal place).
Explanation
Quadratic formula: x=[−4±√(16+32)]/2 = −2±2√3 ≈ 1.464, −5.464.
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