4b^2-10b=13

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Solution for 4b^2-10b=13 equation:


Simplifying
4b2 + -10b = 13

Reorder the terms:
-10b + 4b2 = 13

Solving
-10b + 4b2 = 13

Solving for variable 'b'.

Reorder the terms:
-13 + -10b + 4b2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + -10b + 4b2 = 0

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

Divide each side by '4'.
-3.25 + -2.5b + b2 = 0

Move the constant term to the right:

Add '3.25' to each side of the equation.
-3.25 + -2.5b + 3.25 + b2 = 0 + 3.25

Reorder the terms:
-3.25 + 3.25 + -2.5b + b2 = 0 + 3.25

Combine like terms: -3.25 + 3.25 = 0.00
0.00 + -2.5b + b2 = 0 + 3.25
-2.5b + b2 = 0 + 3.25

Combine like terms: 0 + 3.25 = 3.25
-2.5b + b2 = 3.25

The b term is -2.5b.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5b + 1.5625 + b2 = 3.25 + 1.5625

Reorder the terms:
1.5625 + -2.5b + b2 = 3.25 + 1.5625

Combine like terms: 3.25 + 1.5625 = 4.8125
1.5625 + -2.5b + b2 = 4.8125

Factor a perfect square on the left side:
(b + -1.25)(b + -1.25) = 4.8125

Calculate the square root of the right side: 2.193741097

Break this problem into two subproblems by setting 
(b + -1.25) equal to 2.193741097 and -2.193741097.

Subproblem 1

b + -1.25 = 2.193741097 Simplifying b + -1.25 = 2.193741097 Reorder the terms: -1.25 + b = 2.193741097 Solving -1.25 + b = 2.193741097 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + b = 2.193741097 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + b = 2.193741097 + 1.25 b = 2.193741097 + 1.25 Combine like terms: 2.193741097 + 1.25 = 3.443741097 b = 3.443741097 Simplifying b = 3.443741097

Subproblem 2

b + -1.25 = -2.193741097 Simplifying b + -1.25 = -2.193741097 Reorder the terms: -1.25 + b = -2.193741097 Solving -1.25 + b = -2.193741097 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + b = -2.193741097 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + b = -2.193741097 + 1.25 b = -2.193741097 + 1.25 Combine like terms: -2.193741097 + 1.25 = -0.943741097 b = -0.943741097 Simplifying b = -0.943741097

Solution

The solution to the problem is based on the solutions from the subproblems. b = {3.443741097, -0.943741097}

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