b^2-4b=-7

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Solution for b^2-4b=-7 equation:


Simplifying
b2 + -4b = -7

Reorder the terms:
-4b + b2 = -7

Solving
-4b + b2 = -7

Solving for variable 'b'.

Reorder the terms:
7 + -4b + b2 = -7 + 7

Combine like terms: -7 + 7 = 0
7 + -4b + b2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -4b + -7 + b2 = 0 + -7

Reorder the terms:
7 + -7 + -4b + b2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -4b + b2 = 0 + -7
-4b + b2 = 0 + -7

Combine like terms: 0 + -7 = -7
-4b + b2 = -7

The b term is -4b.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4b + 4 + b2 = -7 + 4

Reorder the terms:
4 + -4b + b2 = -7 + 4

Combine like terms: -7 + 4 = -3
4 + -4b + b2 = -3

Factor a perfect square on the left side:
(b + -2)(b + -2) = -3

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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