(1.5b-6)(2b+5)=

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Solution for (1.5b-6)(2b+5)= equation:


Simplifying
(1.5b + -6)(2b + 5) = 0

Reorder the terms:
(-6 + 1.5b)(2b + 5) = 0

Reorder the terms:
(-6 + 1.5b)(5 + 2b) = 0

Multiply (-6 + 1.5b) * (5 + 2b)
(-6(5 + 2b) + 1.5b * (5 + 2b)) = 0
((5 * -6 + 2b * -6) + 1.5b * (5 + 2b)) = 0
((-30 + -12b) + 1.5b * (5 + 2b)) = 0
(-30 + -12b + (5 * 1.5b + 2b * 1.5b)) = 0
(-30 + -12b + (7.5b + 3b2)) = 0

Combine like terms: -12b + 7.5b = -4.5b
(-30 + -4.5b + 3b2) = 0

Solving
-30 + -4.5b + 3b2 = 0

Solving for variable 'b'.

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

Divide each side by '3'.
-10 + -1.5b + b2 = 0

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + -1.5b + 10 + b2 = 0 + 10

Reorder the terms:
-10 + 10 + -1.5b + b2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + -1.5b + b2 = 0 + 10
-1.5b + b2 = 0 + 10

Combine like terms: 0 + 10 = 10
-1.5b + b2 = 10

The b term is -1.5b.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5b + 0.5625 + b2 = 10 + 0.5625

Reorder the terms:
0.5625 + -1.5b + b2 = 10 + 0.5625

Combine like terms: 10 + 0.5625 = 10.5625
0.5625 + -1.5b + b2 = 10.5625

Factor a perfect square on the left side:
(b + -0.75)(b + -0.75) = 10.5625

Calculate the square root of the right side: 3.25

Break this problem into two subproblems by setting 
(b + -0.75) equal to 3.25 and -3.25.

Subproblem 1

b + -0.75 = 3.25 Simplifying b + -0.75 = 3.25 Reorder the terms: -0.75 + b = 3.25 Solving -0.75 + b = 3.25 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + b = 3.25 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + b = 3.25 + 0.75 b = 3.25 + 0.75 Combine like terms: 3.25 + 0.75 = 4 b = 4 Simplifying b = 4

Subproblem 2

b + -0.75 = -3.25 Simplifying b + -0.75 = -3.25 Reorder the terms: -0.75 + b = -3.25 Solving -0.75 + b = -3.25 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + b = -3.25 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + b = -3.25 + 0.75 b = -3.25 + 0.75 Combine like terms: -3.25 + 0.75 = -2.5 b = -2.5 Simplifying b = -2.5

Solution

The solution to the problem is based on the solutions from the subproblems. b = {4, -2.5}

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