quadratic equation: y=ax2 + bx + c, how to find x?

👨🏻‍🏫 學術台數學

[匿名]

2008-09-09 6:25 am

If y, a, b and c are known, How do I find x? Urgent, please!!!!

Thank you very much.

回答 (2)

ngai

2008-09-13 6:38 am

✔ 最佳答案

y=ax2 + bx + c
y-c=2ax+bx
y-c=x(2a+b)
x=(y-3)/(2a+b)

參考: MATHS BOOK

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Ying Kit

2008-09-09 7:39 am

□□-b±√[(b^2)-4a(c-y)]
x=--------------------------
□□□□2a

參考: ???

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