Roots provides algebraic solutions for quadratic and cubic equations.

- solve A*x
^{2}+ B*x + C = 0:- real_roots = ROOTS(ABCvector, quadratic_roots [, *errorLabel])

- real_roots = number of real roots found
- REAL :: ABCvector(3), quadratic_roots(2)
- ABCvector = (A, B, C)
- optional: *errorLabel ⇾ on error jump to label
- Example: x
^{2}- x + 6 = 0- DIMENSION ABC(3), sqare_roots(2) ! define the 2 vectors
- ABC = ( 1, -1, 6 )
- found = ROOTS( ABC, sqare_roots ) ! sets real_roots=2 and sqare_roots = (3, -2)

- solve A*x
^{3}+ B*x^{2}+ C*x + D = 0:- real_roots = ROOTS(ABCDvector, cubic_roots [, zero_discriminant [, *errorLabel]])

- real_roots = number of real roots found
- DIMENSION ABCDvector(4), cubic_roots(3)
- ABCDvector = (A, B, C, D)
- optional: zero_discriminant (default 1E-10)

ROOTS uses Cardano's method. There will be 3 real roots if discriminant is less than this value - optional: *errorLabel ⇾ on error jump to label
- in 1225
**Leonardo of Pisa**found the root of

x^{3}+ 2*x^{2}+ 10*x - 20 = 0

to be 1 .368808107. Nobody knows by what method he achieved that. HicEst does it by- ABCD = (1, 2, 10, -20)
- found = ROOTS(ABCD, cubic_roots, 1E-14, *999)
- ! found=1 and cubic_roots(1) = 1.368808107

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©2000-2018 Georg Petrich, HicEst Instant Prototype Computing. All rights reserved.

©2000-2018 Georg Petrich, HicEst Instant Prototype Computing. All rights reserved.