4b^2+16b+15=(2b-5)

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Solution for 4b^2+16b+15=(2b-5) equation:


Simplifying
4b2 + 16b + 15 = (2b + -5)

Reorder the terms:
15 + 16b + 4b2 = (2b + -5)

Reorder the terms:
15 + 16b + 4b2 = (-5 + 2b)

Remove parenthesis around (-5 + 2b)
15 + 16b + 4b2 = -5 + 2b

Solving
15 + 16b + 4b2 = -5 + 2b

Solving for variable 'b'.

Reorder the terms:
15 + 5 + 16b + -2b + 4b2 = -5 + 2b + 5 + -2b

Combine like terms: 15 + 5 = 20
20 + 16b + -2b + 4b2 = -5 + 2b + 5 + -2b

Combine like terms: 16b + -2b = 14b
20 + 14b + 4b2 = -5 + 2b + 5 + -2b

Reorder the terms:
20 + 14b + 4b2 = -5 + 5 + 2b + -2b

Combine like terms: -5 + 5 = 0
20 + 14b + 4b2 = 0 + 2b + -2b
20 + 14b + 4b2 = 2b + -2b

Combine like terms: 2b + -2b = 0
20 + 14b + 4b2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(10 + 7b + 2b2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(10 + 7b + 2b2)' equal to zero and attempt to solve: Simplifying 10 + 7b + 2b2 = 0 Solving 10 + 7b + 2b2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 5 + 3.5b + b2 = 0 Move the constant term to the right: Add '-5' to each side of the equation. 5 + 3.5b + -5 + b2 = 0 + -5 Reorder the terms: 5 + -5 + 3.5b + b2 = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 3.5b + b2 = 0 + -5 3.5b + b2 = 0 + -5 Combine like terms: 0 + -5 = -5 3.5b + b2 = -5 The b term is 3.5b. Take half its coefficient (1.75). Square it (3.0625) and add it to both sides. Add '3.0625' to each side of the equation. 3.5b + 3.0625 + b2 = -5 + 3.0625 Reorder the terms: 3.0625 + 3.5b + b2 = -5 + 3.0625 Combine like terms: -5 + 3.0625 = -1.9375 3.0625 + 3.5b + b2 = -1.9375 Factor a perfect square on the left side: (b + 1.75)(b + 1.75) = -1.9375 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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