x^2-7x=-28

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Solution for x^2-7x=-28 equation:


Simplifying
x2 + -7x = -28

Reorder the terms:
-7x + x2 = -28

Solving
-7x + x2 = -28

Solving for variable 'x'.

Reorder the terms:
28 + -7x + x2 = -28 + 28

Combine like terms: -28 + 28 = 0
28 + -7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-28' to each side of the equation.
28 + -7x + -28 + x2 = 0 + -28

Reorder the terms:
28 + -28 + -7x + x2 = 0 + -28

Combine like terms: 28 + -28 = 0
0 + -7x + x2 = 0 + -28
-7x + x2 = 0 + -28

Combine like terms: 0 + -28 = -28
-7x + x2 = -28

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = -28 + 12.25

Reorder the terms:
12.25 + -7x + x2 = -28 + 12.25

Combine like terms: -28 + 12.25 = -15.75
12.25 + -7x + x2 = -15.75

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = -15.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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