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Author Question: When does the equation x2 + y2 + z2 + Ax + By + Cz + D = 0 represent a sphere? (Read 177 times)

waynest

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on: May 27, 2021
When does the equation x2 + y2 + z2 + Ax + By + Cz + D = 0 represent a sphere?
◦ if and only if A2 + B2 - C2  > D
◦ if and only if A = 0, B = 0, C = 0, and D < 0
◦ if and only if A2 + B2 + C2 + D > 0
◦ if and only if A2 + B2 + C2  > 4D
◦ if and only if A2 - B2 + C2  > 0
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Marked as best answer by waynest on May 27, 2021

steff9894

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Reply #1 on: May 27, 2021
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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waynest

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Reply 2 on: May 27, 2021
Wow, this really help

abro1885

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Reply 3 on: Yesterday
Excellent

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