5x+5=4x^2-100

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Solution for 5x+5=4x^2-100 equation:


Simplifying
5x + 5 = 4x2 + -100

Reorder the terms:
5 + 5x = 4x2 + -100

Reorder the terms:
5 + 5x = -100 + 4x2

Solving
5 + 5x = -100 + 4x2

Solving for variable 'x'.

Reorder the terms:
5 + 100 + 5x + -4x2 = -100 + 4x2 + 100 + -4x2

Combine like terms: 5 + 100 = 105
105 + 5x + -4x2 = -100 + 4x2 + 100 + -4x2

Reorder the terms:
105 + 5x + -4x2 = -100 + 100 + 4x2 + -4x2

Combine like terms: -100 + 100 = 0
105 + 5x + -4x2 = 0 + 4x2 + -4x2
105 + 5x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
105 + 5x + -4x2 = 0

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

Divide each side by '-4'.
-26.25 + -1.25x + x2 = 0

Move the constant term to the right:

Add '26.25' to each side of the equation.
-26.25 + -1.25x + 26.25 + x2 = 0 + 26.25

Reorder the terms:
-26.25 + 26.25 + -1.25x + x2 = 0 + 26.25

Combine like terms: -26.25 + 26.25 = 0.00
0.00 + -1.25x + x2 = 0 + 26.25
-1.25x + x2 = 0 + 26.25

Combine like terms: 0 + 26.25 = 26.25
-1.25x + x2 = 26.25

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 = 26.25 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 26.25 + 0.390625

Combine like terms: 26.25 + 0.390625 = 26.640625
0.390625 + -1.25x + x2 = 26.640625

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 26.640625

Calculate the square root of the right side: 5.161455706

Break this problem into two subproblems by setting 
(x + -0.625) equal to 5.161455706 and -5.161455706.

Subproblem 1

x + -0.625 = 5.161455706 Simplifying x + -0.625 = 5.161455706 Reorder the terms: -0.625 + x = 5.161455706 Solving -0.625 + x = 5.161455706 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 = 5.161455706 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 5.161455706 + 0.625 x = 5.161455706 + 0.625 Combine like terms: 5.161455706 + 0.625 = 5.786455706 x = 5.786455706 Simplifying x = 5.786455706

Subproblem 2

x + -0.625 = -5.161455706 Simplifying x + -0.625 = -5.161455706 Reorder the terms: -0.625 + x = -5.161455706 Solving -0.625 + x = -5.161455706 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 = -5.161455706 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -5.161455706 + 0.625 x = -5.161455706 + 0.625 Combine like terms: -5.161455706 + 0.625 = -4.536455706 x = -4.536455706 Simplifying x = -4.536455706

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.786455706, -4.536455706}

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