7-x(x-4)=19

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Solution for 7-x(x-4)=19 equation:


Simplifying
7 + -1x(x + -4) = 19

Reorder the terms:
7 + -1x(-4 + x) = 19
7 + (-4 * -1x + x * -1x) = 19
7 + (4x + -1x2) = 19

Solving
7 + 4x + -1x2 = 19

Solving for variable 'x'.

Reorder the terms:
7 + -19 + 4x + -1x2 = 19 + -19

Combine like terms: 7 + -19 = -12
-12 + 4x + -1x2 = 19 + -19

Combine like terms: 19 + -19 = 0
-12 + 4x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
12 + -4x + x2 = 0

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -4x + -12 + x2 = 0 + -12

Reorder the terms:
12 + -12 + -4x + x2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -4x + x2 = 0 + -12
-4x + x2 = 0 + -12

Combine like terms: 0 + -12 = -12
-4x + x2 = -12

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

Add '4' to each side of the equation.
-4x + 4 + x2 = -12 + 4

Reorder the terms:
4 + -4x + x2 = -12 + 4

Combine like terms: -12 + 4 = -8
4 + -4x + x2 = -8

Factor a perfect square on the left side:
(x + -2)(x + -2) = -8

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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