-4x^2-4=5x-7

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Solution for -4x^2-4=5x-7 equation:


Simplifying
-4x2 + -4 = 5x + -7

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

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

Solving
-4 + -4x2 = -7 + 5x

Solving for variable 'x'.

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

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

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

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

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

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

Divide each side by '-4'.
-0.75 + 1.25x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + 1.25x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + 1.25x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 1.25x + x2 = 0 + 0.75
1.25x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
1.25x + x2 = 0.75

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 0.75 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 0.75 + 0.390625

Combine like terms: 0.75 + 0.390625 = 1.140625
0.390625 + 1.25x + x2 = 1.140625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 1.140625

Calculate the square root of the right side: 1.068000468

Break this problem into two subproblems by setting 
(x + 0.625) equal to 1.068000468 and -1.068000468.

Subproblem 1

x + 0.625 = 1.068000468 Simplifying x + 0.625 = 1.068000468 Reorder the terms: 0.625 + x = 1.068000468 Solving 0.625 + x = 1.068000468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 1.068000468 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 1.068000468 + -0.625 x = 1.068000468 + -0.625 Combine like terms: 1.068000468 + -0.625 = 0.443000468 x = 0.443000468 Simplifying x = 0.443000468

Subproblem 2

x + 0.625 = -1.068000468 Simplifying x + 0.625 = -1.068000468 Reorder the terms: 0.625 + x = -1.068000468 Solving 0.625 + x = -1.068000468 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -1.068000468 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -1.068000468 + -0.625 x = -1.068000468 + -0.625 Combine like terms: -1.068000468 + -0.625 = -1.693000468 x = -1.693000468 Simplifying x = -1.693000468

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.443000468, -1.693000468}

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