7b^2-6b-4=3

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Solution for 7b^2-6b-4=3 equation:


Simplifying
7b2 + -6b + -4 = 3

Reorder the terms:
-4 + -6b + 7b2 = 3

Solving
-4 + -6b + 7b2 = 3

Solving for variable 'b'.

Reorder the terms:
-4 + -3 + -6b + 7b2 = 3 + -3

Combine like terms: -4 + -3 = -7
-7 + -6b + 7b2 = 3 + -3

Combine like terms: 3 + -3 = 0
-7 + -6b + 7b2 = 0

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

Divide each side by '7'.
-1 + -0.8571428571b + b2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.8571428571b + 1 + b2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.8571428571b + b2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.8571428571b + b2 = 0 + 1
-0.8571428571b + b2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.8571428571b + b2 = 1

The b term is -0.8571428571b.  Take half its coefficient (-0.4285714286).
Square it (0.1836734694) and add it to both sides.

Add '0.1836734694' to each side of the equation.
-0.8571428571b + 0.1836734694 + b2 = 1 + 0.1836734694

Reorder the terms:
0.1836734694 + -0.8571428571b + b2 = 1 + 0.1836734694

Combine like terms: 1 + 0.1836734694 = 1.1836734694
0.1836734694 + -0.8571428571b + b2 = 1.1836734694

Factor a perfect square on the left side:
(b + -0.4285714286)(b + -0.4285714286) = 1.1836734694

Calculate the square root of the right side: 1.087967587

Break this problem into two subproblems by setting 
(b + -0.4285714286) equal to 1.087967587 and -1.087967587.

Subproblem 1

b + -0.4285714286 = 1.087967587 Simplifying b + -0.4285714286 = 1.087967587 Reorder the terms: -0.4285714286 + b = 1.087967587 Solving -0.4285714286 + b = 1.087967587 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.4285714286' to each side of the equation. -0.4285714286 + 0.4285714286 + b = 1.087967587 + 0.4285714286 Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000 0.0000000000 + b = 1.087967587 + 0.4285714286 b = 1.087967587 + 0.4285714286 Combine like terms: 1.087967587 + 0.4285714286 = 1.5165390156 b = 1.5165390156 Simplifying b = 1.5165390156

Subproblem 2

b + -0.4285714286 = -1.087967587 Simplifying b + -0.4285714286 = -1.087967587 Reorder the terms: -0.4285714286 + b = -1.087967587 Solving -0.4285714286 + b = -1.087967587 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.4285714286' to each side of the equation. -0.4285714286 + 0.4285714286 + b = -1.087967587 + 0.4285714286 Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000 0.0000000000 + b = -1.087967587 + 0.4285714286 b = -1.087967587 + 0.4285714286 Combine like terms: -1.087967587 + 0.4285714286 = -0.6593961584 b = -0.6593961584 Simplifying b = -0.6593961584

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.5165390156, -0.6593961584}

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