(7-x)(1-x)+18=0

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Solution for (7-x)(1-x)+18=0 equation:


Simplifying
(7 + -1x)(1 + -1x) + 18 = 0

Multiply (7 + -1x) * (1 + -1x)
(7(1 + -1x) + -1x * (1 + -1x)) + 18 = 0
((1 * 7 + -1x * 7) + -1x * (1 + -1x)) + 18 = 0
((7 + -7x) + -1x * (1 + -1x)) + 18 = 0
(7 + -7x + (1 * -1x + -1x * -1x)) + 18 = 0
(7 + -7x + (-1x + 1x2)) + 18 = 0

Combine like terms: -7x + -1x = -8x
(7 + -8x + 1x2) + 18 = 0

Reorder the terms:
7 + 18 + -8x + 1x2 = 0

Combine like terms: 7 + 18 = 25
25 + -8x + 1x2 = 0

Solving
25 + -8x + 1x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + -8x + -25 + x2 = 0 + -25

Reorder the terms:
25 + -25 + -8x + x2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -8x + x2 = 0 + -25
-8x + x2 = 0 + -25

Combine like terms: 0 + -25 = -25
-8x + x2 = -25

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -25 + 16

Reorder the terms:
16 + -8x + x2 = -25 + 16

Combine like terms: -25 + 16 = -9
16 + -8x + x2 = -9

Factor a perfect square on the left side:
(x + -4)(x + -4) = -9

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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