(6x^2+x+7)-(2x^2-9)=

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Solution for (6x^2+x+7)-(2x^2-9)= equation:


Simplifying
(6x2 + x + 7) + -1(2x2 + -9) = 0

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

Remove parenthesis around (7 + x + 6x2)
7 + x + 6x2 + -1(2x2 + -9) = 0

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

Reorder the terms:
7 + 9 + x + 6x2 + -2x2 = 0

Combine like terms: 7 + 9 = 16
16 + x + 6x2 + -2x2 = 0

Combine like terms: 6x2 + -2x2 = 4x2
16 + x + 4x2 = 0

Solving
16 + x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
4 + 0.25x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 0.25x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + 0.25x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 0.25x + x2 = 0 + -4
0.25x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
0.25x + x2 = -4

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.25x + 0.25 + x2 = -4 + 0.25

Reorder the terms:
0.25 + 0.25x + x2 = -4 + 0.25

Combine like terms: -4 + 0.25 = -3.75
0.25 + 0.25x + x2 = -3.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -3.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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