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

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


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

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

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

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

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

Combine like terms: -7 + -4 = -11
-11 + 3x + 1x + 5x2 + -3x2 = 0

Combine like terms: 3x + 1x = 4x
-11 + 4x + 5x2 + -3x2 = 0

Combine like terms: 5x2 + -3x2 = 2x2
-11 + 4x + 2x2 = 0

Solving
-11 + 4x + 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'.
-5.5 + 2x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + 2x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + 2x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + 2x + x2 = 0 + 5.5
2x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
2x + x2 = 5.5

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 5.5 + 1

Reorder the terms:
1 + 2x + x2 = 5.5 + 1

Combine like terms: 5.5 + 1 = 6.5
1 + 2x + x2 = 6.5

Factor a perfect square on the left side:
(x + 1)(x + 1) = 6.5

Calculate the square root of the right side: 2.549509757

Break this problem into two subproblems by setting 
(x + 1) equal to 2.549509757 and -2.549509757.

Subproblem 1

x + 1 = 2.549509757 Simplifying x + 1 = 2.549509757 Reorder the terms: 1 + x = 2.549509757 Solving 1 + x = 2.549509757 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 2.549509757 + -1 Combine like terms: 1 + -1 = 0 0 + x = 2.549509757 + -1 x = 2.549509757 + -1 Combine like terms: 2.549509757 + -1 = 1.549509757 x = 1.549509757 Simplifying x = 1.549509757

Subproblem 2

x + 1 = -2.549509757 Simplifying x + 1 = -2.549509757 Reorder the terms: 1 + x = -2.549509757 Solving 1 + x = -2.549509757 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -2.549509757 + -1 Combine like terms: 1 + -1 = 0 0 + x = -2.549509757 + -1 x = -2.549509757 + -1 Combine like terms: -2.549509757 + -1 = -3.549509757 x = -3.549509757 Simplifying x = -3.549509757

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.549509757, -3.549509757}

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