(3x^2-7x+5)-(4x^2-3x^2+12)=

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Solution for (3x^2-7x+5)-(4x^2-3x^2+12)= equation:


Simplifying
(3x2 + -7x + 5) + -1(4x2 + -3x2 + 12) = 0

Reorder the terms:
(5 + -7x + 3x2) + -1(4x2 + -3x2 + 12) = 0

Remove parenthesis around (5 + -7x + 3x2)
5 + -7x + 3x2 + -1(4x2 + -3x2 + 12) = 0

Reorder the terms:
5 + -7x + 3x2 + -1(12 + 4x2 + -3x2) = 0

Combine like terms: 4x2 + -3x2 = 1x2
5 + -7x + 3x2 + -1(12 + 1x2) = 0
5 + -7x + 3x2 + (12 * -1 + 1x2 * -1) = 0
5 + -7x + 3x2 + (-12 + -1x2) = 0

Reorder the terms:
5 + -12 + -7x + 3x2 + -1x2 = 0

Combine like terms: 5 + -12 = -7
-7 + -7x + 3x2 + -1x2 = 0

Combine like terms: 3x2 + -1x2 = 2x2
-7 + -7x + 2x2 = 0

Solving
-7 + -7x + 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'.
-3.5 + -3.5x + x2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + -3.5x + 3.5 + x2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + -3.5x + x2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -3.5x + x2 = 0 + 3.5
-3.5x + x2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
-3.5x + x2 = 3.5

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 3.5 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 3.5 + 3.0625

Combine like terms: 3.5 + 3.0625 = 6.5625
3.0625 + -3.5x + x2 = 6.5625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 6.5625

Calculate the square root of the right side: 2.561737691

Break this problem into two subproblems by setting 
(x + -1.75) equal to 2.561737691 and -2.561737691.

Subproblem 1

x + -1.75 = 2.561737691 Simplifying x + -1.75 = 2.561737691 Reorder the terms: -1.75 + x = 2.561737691 Solving -1.75 + x = 2.561737691 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 2.561737691 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 2.561737691 + 1.75 x = 2.561737691 + 1.75 Combine like terms: 2.561737691 + 1.75 = 4.311737691 x = 4.311737691 Simplifying x = 4.311737691

Subproblem 2

x + -1.75 = -2.561737691 Simplifying x + -1.75 = -2.561737691 Reorder the terms: -1.75 + x = -2.561737691 Solving -1.75 + x = -2.561737691 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -2.561737691 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -2.561737691 + 1.75 x = -2.561737691 + 1.75 Combine like terms: -2.561737691 + 1.75 = -0.811737691 x = -0.811737691 Simplifying x = -0.811737691

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.311737691, -0.811737691}

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