9b^2-15b+4=8

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Solution for 9b^2-15b+4=8 equation:


Simplifying
9b2 + -15b + 4 = 8

Reorder the terms:
4 + -15b + 9b2 = 8

Solving
4 + -15b + 9b2 = 8

Solving for variable 'b'.

Reorder the terms:
4 + -8 + -15b + 9b2 = 8 + -8

Combine like terms: 4 + -8 = -4
-4 + -15b + 9b2 = 8 + -8

Combine like terms: 8 + -8 = 0
-4 + -15b + 9b2 = 0

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

Divide each side by '9'.
-0.4444444444 + -1.666666667b + b2 = 0

Move the constant term to the right:

Add '0.4444444444' to each side of the equation.
-0.4444444444 + -1.666666667b + 0.4444444444 + b2 = 0 + 0.4444444444

Reorder the terms:
-0.4444444444 + 0.4444444444 + -1.666666667b + b2 = 0 + 0.4444444444

Combine like terms: -0.4444444444 + 0.4444444444 = 0.0000000000
0.0000000000 + -1.666666667b + b2 = 0 + 0.4444444444
-1.666666667b + b2 = 0 + 0.4444444444

Combine like terms: 0 + 0.4444444444 = 0.4444444444
-1.666666667b + b2 = 0.4444444444

The b term is -1.666666667b.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667b + 0.6944444447 + b2 = 0.4444444444 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667b + b2 = 0.4444444444 + 0.6944444447

Combine like terms: 0.4444444444 + 0.6944444447 = 1.1388888891
0.6944444447 + -1.666666667b + b2 = 1.1388888891

Factor a perfect square on the left side:
(b + -0.8333333335)(b + -0.8333333335) = 1.1388888891

Calculate the square root of the right side: 1.067187373

Break this problem into two subproblems by setting 
(b + -0.8333333335) equal to 1.067187373 and -1.067187373.

Subproblem 1

b + -0.8333333335 = 1.067187373 Simplifying b + -0.8333333335 = 1.067187373 Reorder the terms: -0.8333333335 + b = 1.067187373 Solving -0.8333333335 + b = 1.067187373 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + b = 1.067187373 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + b = 1.067187373 + 0.8333333335 b = 1.067187373 + 0.8333333335 Combine like terms: 1.067187373 + 0.8333333335 = 1.9005207065 b = 1.9005207065 Simplifying b = 1.9005207065

Subproblem 2

b + -0.8333333335 = -1.067187373 Simplifying b + -0.8333333335 = -1.067187373 Reorder the terms: -0.8333333335 + b = -1.067187373 Solving -0.8333333335 + b = -1.067187373 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + b = -1.067187373 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + b = -1.067187373 + 0.8333333335 b = -1.067187373 + 0.8333333335 Combine like terms: -1.067187373 + 0.8333333335 = -0.2338540395 b = -0.2338540395 Simplifying b = -0.2338540395

Solution

The solution to the problem is based on the solutions from the subproblems. b = {1.9005207065, -0.2338540395}

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