(3x^2+4x-12)-(5x^2-x+6)=

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Solution for (3x^2+4x-12)-(5x^2-x+6)= equation:


Simplifying
(3x2 + 4x + -12) + -1(5x2 + -1x + 6) = 0

Reorder the terms:
(-12 + 4x + 3x2) + -1(5x2 + -1x + 6) = 0

Remove parenthesis around (-12 + 4x + 3x2)
-12 + 4x + 3x2 + -1(5x2 + -1x + 6) = 0

Reorder the terms:
-12 + 4x + 3x2 + -1(6 + -1x + 5x2) = 0
-12 + 4x + 3x2 + (6 * -1 + -1x * -1 + 5x2 * -1) = 0
-12 + 4x + 3x2 + (-6 + 1x + -5x2) = 0

Reorder the terms:
-12 + -6 + 4x + 1x + 3x2 + -5x2 = 0

Combine like terms: -12 + -6 = -18
-18 + 4x + 1x + 3x2 + -5x2 = 0

Combine like terms: 4x + 1x = 5x
-18 + 5x + 3x2 + -5x2 = 0

Combine like terms: 3x2 + -5x2 = -2x2
-18 + 5x + -2x2 = 0

Solving
-18 + 5x + -2x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
9 + -2.5x + x2 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -2.5x + -9 + x2 = 0 + -9

Reorder the terms:
9 + -9 + -2.5x + x2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -2.5x + x2 = 0 + -9
-2.5x + x2 = 0 + -9

Combine like terms: 0 + -9 = -9
-2.5x + x2 = -9

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = -9 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = -9 + 1.5625

Combine like terms: -9 + 1.5625 = -7.4375
1.5625 + -2.5x + x2 = -7.4375

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = -7.4375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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