From bb24c21320b0a4b7b6ea99a185a4ec526c8fab2e Mon Sep 17 00:00:00 2001
From: Ruben Dashyan <ruben.dashyan@numworks.com>
Date: Wed, 26 Feb 2020 16:47:01 +0100
Subject: [PATCH] [poincare/solver] Fix typo in BrentRoot algorithm

---
 poincare/src/solver.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/poincare/src/solver.cpp b/poincare/src/solver.cpp
index ac43c9646..33914717e 100644
--- a/poincare/src/solver.cpp
+++ b/poincare/src/solver.cpp
@@ -138,7 +138,7 @@ double Solver::BrentRoot(double ax, double bx, double precision, ValueAtAbscissa
         return b;
       }
     }
-    if (std::fabs(e) >= tol1 && std::fabs(fa) > std::fabs(b)) {
+    if (std::fabs(e) >= tol1 && std::fabs(fa) > std::fabs(fb)) {
       double s = fb/fa;
       double p = 2.0*xm*s;
       double q = 1.0-s;
@@ -168,7 +168,7 @@ double Solver::BrentRoot(double ax, double bx, double precision, ValueAtAbscissa
     if (std::fabs(d) > tol1) {
       b += d;
     } else {
-      b += xm > 0.0 ? tol1 : tol1;
+      b += xm > 0.0 ? tol1 : -tol1;
     }
     fb = evaluation(b, context, complexFormat, angleUnit, context1, context2, context3);
   }