(6x^2-2x-8)-(x^2-9x-18)=

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Solution for (6x^2-2x-8)-(x^2-9x-18)= equation:


Simplifying
(6x2 + -2x + -8) + -1(x2 + -9x + -18) = 0

Reorder the terms:
(-8 + -2x + 6x2) + -1(x2 + -9x + -18) = 0

Remove parenthesis around (-8 + -2x + 6x2)
-8 + -2x + 6x2 + -1(x2 + -9x + -18) = 0

Reorder the terms:
-8 + -2x + 6x2 + -1(-18 + -9x + x2) = 0
-8 + -2x + 6x2 + (-18 * -1 + -9x * -1 + x2 * -1) = 0
-8 + -2x + 6x2 + (18 + 9x + -1x2) = 0

Reorder the terms:
-8 + 18 + -2x + 9x + 6x2 + -1x2 = 0

Combine like terms: -8 + 18 = 10
10 + -2x + 9x + 6x2 + -1x2 = 0

Combine like terms: -2x + 9x = 7x
10 + 7x + 6x2 + -1x2 = 0

Combine like terms: 6x2 + -1x2 = 5x2
10 + 7x + 5x2 = 0

Solving
10 + 7x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
2 + 1.4x + x2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 1.4x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + 1.4x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 1.4x + x2 = 0 + -2
1.4x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
1.4x + x2 = -2

The x term is 1.4x.  Take half its coefficient (0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
1.4x + 0.49 + x2 = -2 + 0.49

Reorder the terms:
0.49 + 1.4x + x2 = -2 + 0.49

Combine like terms: -2 + 0.49 = -1.51
0.49 + 1.4x + x2 = -1.51

Factor a perfect square on the left side:
(x + 0.7)(x + 0.7) = -1.51

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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