4b^2-7b-6=0

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Solution for 4b^2-7b-6=0 equation:


Simplifying
4b2 + -7b + -6 = 0

Reorder the terms:
-6 + -7b + 4b2 = 0

Solving
-6 + -7b + 4b2 = 0

Solving for variable 'b'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-1.5 + -1.75b + b2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -1.75b + 1.5 + b2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -1.75b + b2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -1.75b + b2 = 0 + 1.5
-1.75b + b2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-1.75b + b2 = 1.5

The b term is -1.75b.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75b + 0.765625 + b2 = 1.5 + 0.765625

Reorder the terms:
0.765625 + -1.75b + b2 = 1.5 + 0.765625

Combine like terms: 1.5 + 0.765625 = 2.265625
0.765625 + -1.75b + b2 = 2.265625

Factor a perfect square on the left side:
(b + -0.875)(b + -0.875) = 2.265625

Calculate the square root of the right side: 1.505199322

Break this problem into two subproblems by setting 
(b + -0.875) equal to 1.505199322 and -1.505199322.

Subproblem 1

b + -0.875 = 1.505199322 Simplifying b + -0.875 = 1.505199322 Reorder the terms: -0.875 + b = 1.505199322 Solving -0.875 + b = 1.505199322 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + b = 1.505199322 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + b = 1.505199322 + 0.875 b = 1.505199322 + 0.875 Combine like terms: 1.505199322 + 0.875 = 2.380199322 b = 2.380199322 Simplifying b = 2.380199322

Subproblem 2

b + -0.875 = -1.505199322 Simplifying b + -0.875 = -1.505199322 Reorder the terms: -0.875 + b = -1.505199322 Solving -0.875 + b = -1.505199322 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + b = -1.505199322 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + b = -1.505199322 + 0.875 b = -1.505199322 + 0.875 Combine like terms: -1.505199322 + 0.875 = -0.630199322 b = -0.630199322 Simplifying b = -0.630199322

Solution

The solution to the problem is based on the solutions from the subproblems. b = {2.380199322, -0.630199322}

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