(10.8b^2-5.7b+7.2)-(2.9b^2-4.6b-3.1)=

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Solution for (10.8b^2-5.7b+7.2)-(2.9b^2-4.6b-3.1)= equation:


Simplifying
(10.8b2 + -5.7b + 7.2) + -1(2.9b2 + -4.6b + -3.1) = 0

Reorder the terms:
(7.2 + -5.7b + 10.8b2) + -1(2.9b2 + -4.6b + -3.1) = 0

Remove parenthesis around (7.2 + -5.7b + 10.8b2)
7.2 + -5.7b + 10.8b2 + -1(2.9b2 + -4.6b + -3.1) = 0

Reorder the terms:
7.2 + -5.7b + 10.8b2 + -1(-3.1 + -4.6b + 2.9b2) = 0
7.2 + -5.7b + 10.8b2 + (-3.1 * -1 + -4.6b * -1 + 2.9b2 * -1) = 0
7.2 + -5.7b + 10.8b2 + (3.1 + 4.6b + -2.9b2) = 0

Reorder the terms:
7.2 + 3.1 + -5.7b + 4.6b + 10.8b2 + -2.9b2 = 0

Combine like terms: 7.2 + 3.1 = 10.3
10.3 + -5.7b + 4.6b + 10.8b2 + -2.9b2 = 0

Combine like terms: -5.7b + 4.6b = -1.1b
10.3 + -1.1b + 10.8b2 + -2.9b2 = 0

Combine like terms: 10.8b2 + -2.9b2 = 7.9b2
10.3 + -1.1b + 7.9b2 = 0

Solving
10.3 + -1.1b + 7.9b2 = 0

Solving for variable 'b'.

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

Divide each side by '7.9'.
1.303797468 + -0.1392405063b + b2 = 0

Move the constant term to the right:

Add '-1.303797468' to each side of the equation.
1.303797468 + -0.1392405063b + -1.303797468 + b2 = 0 + -1.303797468

Reorder the terms:
1.303797468 + -1.303797468 + -0.1392405063b + b2 = 0 + -1.303797468

Combine like terms: 1.303797468 + -1.303797468 = 0.000000000
0.000000000 + -0.1392405063b + b2 = 0 + -1.303797468
-0.1392405063b + b2 = 0 + -1.303797468

Combine like terms: 0 + -1.303797468 = -1.303797468
-0.1392405063b + b2 = -1.303797468

The b term is -0.1392405063b.  Take half its coefficient (-0.06962025315).
Square it (0.004846979649) and add it to both sides.

Add '0.004846979649' to each side of the equation.
-0.1392405063b + 0.004846979649 + b2 = -1.303797468 + 0.004846979649

Reorder the terms:
0.004846979649 + -0.1392405063b + b2 = -1.303797468 + 0.004846979649

Combine like terms: -1.303797468 + 0.004846979649 = -1.298950488351
0.004846979649 + -0.1392405063b + b2 = -1.298950488351

Factor a perfect square on the left side:
(b + -0.06962025315)(b + -0.06962025315) = -1.298950488351

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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