Average Error: 28.6 → 0.6
Time: 43.3s
Precision: 64
Internal Precision: 576
\[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}}{3 \cdot a}\]
\[\frac{\left(a \cdot c\right) \cdot 3}{\left(a \cdot -3\right) \cdot b + \frac{\left(a \cdot -3\right) \cdot \sqrt{{\left(b \cdot b\right)}^{3} + {\left(a \cdot \left(c \cdot -3\right)\right)}^{3}}}{\sqrt{\left(\left(b \cdot b\right) \cdot \left(b \cdot b\right) - \left(a \cdot \left(c \cdot -3\right)\right) \cdot \left(b \cdot b\right)\right) + \left(a \cdot \left(c \cdot -3\right)\right) \cdot \left(a \cdot \left(c \cdot -3\right)\right)}}}\]

Error

Bits error versus a

Bits error versus b

Bits error versus c

Bits error versus d

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 28.6

    \[\frac{\left(-b\right) + \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}}{3 \cdot a}\]
  2. Using strategy rm
  3. Applied flip-+28.6

    \[\leadsto \frac{\color{blue}{\frac{\left(-b\right) \cdot \left(-b\right) - \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c} \cdot \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}}{\left(-b\right) - \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}}}}{3 \cdot a}\]
  4. Applied associate-/l/28.6

    \[\leadsto \color{blue}{\frac{\left(-b\right) \cdot \left(-b\right) - \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c} \cdot \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}}{\left(3 \cdot a\right) \cdot \left(\left(-b\right) - \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}\right)}}\]
  5. Simplified0.6

    \[\leadsto \frac{\color{blue}{3 \cdot \left(c \cdot a\right)}}{\left(3 \cdot a\right) \cdot \left(\left(-b\right) - \sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}\right)}\]
  6. Using strategy rm
  7. Applied sub-neg0.6

    \[\leadsto \frac{3 \cdot \left(c \cdot a\right)}{\left(3 \cdot a\right) \cdot \color{blue}{\left(\left(-b\right) + \left(-\sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}\right)\right)}}\]
  8. Applied distribute-lft-in0.6

    \[\leadsto \frac{3 \cdot \left(c \cdot a\right)}{\color{blue}{\left(3 \cdot a\right) \cdot \left(-b\right) + \left(3 \cdot a\right) \cdot \left(-\sqrt{b \cdot b - \left(3 \cdot a\right) \cdot c}\right)}}\]
  9. Simplified0.6

    \[\leadsto \frac{3 \cdot \left(c \cdot a\right)}{\left(3 \cdot a\right) \cdot \left(-b\right) + \color{blue}{\sqrt{a \cdot \left(c \cdot -3\right) + b \cdot b} \cdot \left(-3 \cdot a\right)}}\]
  10. Using strategy rm
  11. Applied flip3-+0.6

    \[\leadsto \frac{3 \cdot \left(c \cdot a\right)}{\left(3 \cdot a\right) \cdot \left(-b\right) + \sqrt{\color{blue}{\frac{{\left(a \cdot \left(c \cdot -3\right)\right)}^{3} + {\left(b \cdot b\right)}^{3}}{\left(a \cdot \left(c \cdot -3\right)\right) \cdot \left(a \cdot \left(c \cdot -3\right)\right) + \left(\left(b \cdot b\right) \cdot \left(b \cdot b\right) - \left(a \cdot \left(c \cdot -3\right)\right) \cdot \left(b \cdot b\right)\right)}}} \cdot \left(-3 \cdot a\right)}\]
  12. Applied sqrt-div0.6

    \[\leadsto \frac{3 \cdot \left(c \cdot a\right)}{\left(3 \cdot a\right) \cdot \left(-b\right) + \color{blue}{\frac{\sqrt{{\left(a \cdot \left(c \cdot -3\right)\right)}^{3} + {\left(b \cdot b\right)}^{3}}}{\sqrt{\left(a \cdot \left(c \cdot -3\right)\right) \cdot \left(a \cdot \left(c \cdot -3\right)\right) + \left(\left(b \cdot b\right) \cdot \left(b \cdot b\right) - \left(a \cdot \left(c \cdot -3\right)\right) \cdot \left(b \cdot b\right)\right)}}} \cdot \left(-3 \cdot a\right)}\]
  13. Applied associate-*l/0.6

    \[\leadsto \frac{3 \cdot \left(c \cdot a\right)}{\left(3 \cdot a\right) \cdot \left(-b\right) + \color{blue}{\frac{\sqrt{{\left(a \cdot \left(c \cdot -3\right)\right)}^{3} + {\left(b \cdot b\right)}^{3}} \cdot \left(-3 \cdot a\right)}{\sqrt{\left(a \cdot \left(c \cdot -3\right)\right) \cdot \left(a \cdot \left(c \cdot -3\right)\right) + \left(\left(b \cdot b\right) \cdot \left(b \cdot b\right) - \left(a \cdot \left(c \cdot -3\right)\right) \cdot \left(b \cdot b\right)\right)}}}}\]
  14. Final simplification0.6

    \[\leadsto \frac{\left(a \cdot c\right) \cdot 3}{\left(a \cdot -3\right) \cdot b + \frac{\left(a \cdot -3\right) \cdot \sqrt{{\left(b \cdot b\right)}^{3} + {\left(a \cdot \left(c \cdot -3\right)\right)}^{3}}}{\sqrt{\left(\left(b \cdot b\right) \cdot \left(b \cdot b\right) - \left(a \cdot \left(c \cdot -3\right)\right) \cdot \left(b \cdot b\right)\right) + \left(a \cdot \left(c \cdot -3\right)\right) \cdot \left(a \cdot \left(c \cdot -3\right)\right)}}}\]

Runtime

Time bar (total: 43.3s)Debug logProfile

herbie shell --seed 2018256 
(FPCore (a b c d)
  :name "Cubic critical, narrow range"
  :pre (and (< 1.0536712127723509e-08 a 94906265.62425156) (< 1.0536712127723509e-08 b 94906265.62425156) (< 1.0536712127723509e-08 c 94906265.62425156))
  (/ (+ (- b) (sqrt (- (* b b) (* (* 3 a) c)))) (* 3 a)))