x^2 - 3x + k is a quadratic equation. K is a constant. A (alpha) and B (Beta) are the roots of the equation.
What is A^2 + 3B?
Quadratic equation problem?
2015-11-12 3:43 pm
回答 (1)
2015-11-12 4:33 pm
✔ 最佳答案
∵ α and β are the roots of x² - 3x + k = 0Sub x = α into x² - 3x + k = 0
α² - 3α + k = 0
α² = 3α - k
α² + 3β
= 3α - k + 3β
= 3(α + β) - k
= 3(3) - k
= 9 - k
收錄日期: 2021-04-18 14:01:31
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