4x^2+8x-100=-3

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Solution for 4x^2+8x-100=-3 equation:


Simplifying
4x2 + 8x + -100 = -3

Reorder the terms:
-100 + 8x + 4x2 = -3

Solving
-100 + 8x + 4x2 = -3

Solving for variable 'x'.

Reorder the terms:
-100 + 3 + 8x + 4x2 = -3 + 3

Combine like terms: -100 + 3 = -97
-97 + 8x + 4x2 = -3 + 3

Combine like terms: -3 + 3 = 0
-97 + 8x + 4x2 = 0

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

Divide each side by '4'.
-24.25 + 2x + x2 = 0

Move the constant term to the right:

Add '24.25' to each side of the equation.
-24.25 + 2x + 24.25 + x2 = 0 + 24.25

Reorder the terms:
-24.25 + 24.25 + 2x + x2 = 0 + 24.25

Combine like terms: -24.25 + 24.25 = 0.00
0.00 + 2x + x2 = 0 + 24.25
2x + x2 = 0 + 24.25

Combine like terms: 0 + 24.25 = 24.25
2x + x2 = 24.25

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 = 24.25 + 1

Reorder the terms:
1 + 2x + x2 = 24.25 + 1

Combine like terms: 24.25 + 1 = 25.25
1 + 2x + x2 = 25.25

Factor a perfect square on the left side:
(x + 1)(x + 1) = 25.25

Calculate the square root of the right side: 5.024937811

Break this problem into two subproblems by setting 
(x + 1) equal to 5.024937811 and -5.024937811.

Subproblem 1

x + 1 = 5.024937811 Simplifying x + 1 = 5.024937811 Reorder the terms: 1 + x = 5.024937811 Solving 1 + x = 5.024937811 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 = 5.024937811 + -1 Combine like terms: 1 + -1 = 0 0 + x = 5.024937811 + -1 x = 5.024937811 + -1 Combine like terms: 5.024937811 + -1 = 4.024937811 x = 4.024937811 Simplifying x = 4.024937811

Subproblem 2

x + 1 = -5.024937811 Simplifying x + 1 = -5.024937811 Reorder the terms: 1 + x = -5.024937811 Solving 1 + x = -5.024937811 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 = -5.024937811 + -1 Combine like terms: 1 + -1 = 0 0 + x = -5.024937811 + -1 x = -5.024937811 + -1 Combine like terms: -5.024937811 + -1 = -6.024937811 x = -6.024937811 Simplifying x = -6.024937811

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.024937811, -6.024937811}

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