Added some new problem : Quadatric Equation Solver (L-B)

Author: ahorisaac

L-B/0011 SolveQuadraticEqn (L-B)/QuadEqnSolver.js

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+const QuadEqnSolver = (a, b, c) => {
+  // calculate the discriminant
+  d = b * b - 4 * a * c;
+
+  // find the two solutions for x
+  x1 = (-b + Math.sqrt(d)) / (2 * a);
+  x2 = (-b - Math.sqrt(d)) / (2 * a);
+
+  // return the solution
+  solution = { x1, x2 };
+  return solution;
+};
+
+console.log("🚀 ~ :", QuadEqnSolver(1, 8, 15));
+console.log("🚀 ~ :", QuadEqnSolver(1, 4, 4));
+console.log("🚀 ~ :", QuadEqnSolver(1, -7, 10));

L-B/0011 SolveQuadraticEqn (L-B)/READMD.md

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+# Quadratic Equation Solver
+
+Given a Quadratic Equation
+$$ ax^2+bx+c=0 $$
+
+We wish to find the solutions for __x__.
+We derive the quadratic formula from the equation above.
+$$ x = -b \pm \sqrt(b^2 - 4ac) / 2a $$
+
+Break it down to two solutions
+
+$$ x1 = -b + \sqrt(b^2 - 4ac) / 2a $$
+
+$$ x1 = -b - \sqrt(b^2 - 4ac) / 2a $$
+
+## Example
+
+Given
+$$ x^2+8x+15=0 $$
+$$ a = 1, b = 8, c = 15 $$
+
+---
+
+Solution
+$$ x1 = -8 + \sqrt(8^2 - 4*1*15) / 2*1 $$
+$$ x1 = -3 $$
+
+$$ x1 = -8 - \sqrt(8^2 - 4*1*15) / 2*1 $$
+$$ x1 = -5 $$
+
+---