4b^2+3b-25=0

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Solution for 4b^2+3b-25=0 equation:


Simplifying
4b2 + 3b + -25 = 0

Reorder the terms:
-25 + 3b + 4b2 = 0

Solving
-25 + 3b + 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'.
-6.25 + 0.75b + b2 = 0

Move the constant term to the right:

Add '6.25' to each side of the equation.
-6.25 + 0.75b + 6.25 + b2 = 0 + 6.25

Reorder the terms:
-6.25 + 6.25 + 0.75b + b2 = 0 + 6.25

Combine like terms: -6.25 + 6.25 = 0.00
0.00 + 0.75b + b2 = 0 + 6.25
0.75b + b2 = 0 + 6.25

Combine like terms: 0 + 6.25 = 6.25
0.75b + b2 = 6.25

The b term is 0.75b.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75b + 0.140625 + b2 = 6.25 + 0.140625

Reorder the terms:
0.140625 + 0.75b + b2 = 6.25 + 0.140625

Combine like terms: 6.25 + 0.140625 = 6.390625
0.140625 + 0.75b + b2 = 6.390625

Factor a perfect square on the left side:
(b + 0.375)(b + 0.375) = 6.390625

Calculate the square root of the right side: 2.527968552

Break this problem into two subproblems by setting 
(b + 0.375) equal to 2.527968552 and -2.527968552.

Subproblem 1

b + 0.375 = 2.527968552 Simplifying b + 0.375 = 2.527968552 Reorder the terms: 0.375 + b = 2.527968552 Solving 0.375 + b = 2.527968552 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + b = 2.527968552 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + b = 2.527968552 + -0.375 b = 2.527968552 + -0.375 Combine like terms: 2.527968552 + -0.375 = 2.152968552 b = 2.152968552 Simplifying b = 2.152968552

Subproblem 2

b + 0.375 = -2.527968552 Simplifying b + 0.375 = -2.527968552 Reorder the terms: 0.375 + b = -2.527968552 Solving 0.375 + b = -2.527968552 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + b = -2.527968552 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + b = -2.527968552 + -0.375 b = -2.527968552 + -0.375 Combine like terms: -2.527968552 + -0.375 = -2.902968552 b = -2.902968552 Simplifying b = -2.902968552

Solution

The solution to the problem is based on the solutions from the subproblems. b = {2.152968552, -2.902968552}

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