quadratic equation

👨🏻‍🏫 學術台數學

用戶166516

2009-10-01 3:02 am

Find the possible values of p if 4x^2+px+25=0 has a repected real root.

回答 (1)

用戶2053

2009-10-01 3:06 am

✔ 最佳答案

Since the equation has a repected real root :
△ = p^2 - 4(4)(25) = 0
p^2 - 400 = 0
p^2 = 400
p = 20 or p = -20

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