The extraction
of Rootes.
Master.
Nowe will I shewe you, how you shal extract the roote out of any soche nomber.
And first I must admonishe you, that you shal alwaies vnderstande, soche a roote, as the nomber doeth admit. So that in a square nomber, you shall seke a Square roote onely, and no Cubike roote, nother any other kinde.
Likewaies a Cubike nomber hath no other roote, but a Cubike roote. Excepte the name bee compounde, as zenzicubike, or Squared Cube. For in soche there are 2. sortes of rootes, accordyng to the 2. names that thei beare. That is bothe Square and Cubike roote: as I will anon shewe you. But firste I will beginne with Square nombers, and their rootes. And this generalle order muste you obserue, before all other: That you shall haue by harte, in readie memorie all soche nombers, whose rootes are digites. For as it is superfluous to seke rules for theim, so must thei helpe in all greater nombers, whose rootes are aboue 9. And for your ease in remembraunce, I haue here sette foorthe a table for square nombers.
| Rootes. | Squares. |
|---|---|
| 1. | 1. |
| 2. | 4. |
| 3. | 9. |
| 4. | 16. |
| 5. | 25. |
| 6. | 36. |
| 7. | 49. |
| 8. | 64. |
| 9. | 81. |
Where in the firste columpne, you se the rootes set, and in the seconde piller, right against eche roote, there is set his square. Touchyng whiche I nede to saie no more, but that you be not in any vncertaintie of them, whēyou
