74x^2+7x-7=0

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Solution for 74x^2+7x-7=0 equation:


Simplifying
74x2 + 7x + -7 = 0

Reorder the terms:
-7 + 7x + 74x2 = 0

Solving
-7 + 7x + 74x2 = 0

Solving for variable 'x'.

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

Divide each side by '74'.
-0.09459459459 + 0.09459459459x + x2 = 0

Move the constant term to the right:

Add '0.09459459459' to each side of the equation.
-0.09459459459 + 0.09459459459x + 0.09459459459 + x2 = 0 + 0.09459459459

Reorder the terms:
-0.09459459459 + 0.09459459459 + 0.09459459459x + x2 = 0 + 0.09459459459

Combine like terms: -0.09459459459 + 0.09459459459 = 0.00000000000
0.00000000000 + 0.09459459459x + x2 = 0 + 0.09459459459
0.09459459459x + x2 = 0 + 0.09459459459

Combine like terms: 0 + 0.09459459459 = 0.09459459459
0.09459459459x + x2 = 0.09459459459

The x term is 0.09459459459x.  Take half its coefficient (0.0472972973).
Square it (0.002237034332) and add it to both sides.

Add '0.002237034332' to each side of the equation.
0.09459459459x + 0.002237034332 + x2 = 0.09459459459 + 0.002237034332

Reorder the terms:
0.002237034332 + 0.09459459459x + x2 = 0.09459459459 + 0.002237034332

Combine like terms: 0.09459459459 + 0.002237034332 = 0.096831628922
0.002237034332 + 0.09459459459x + x2 = 0.096831628922

Factor a perfect square on the left side:
(x + 0.0472972973)(x + 0.0472972973) = 0.096831628922

Calculate the square root of the right side: 0.311177809

Break this problem into two subproblems by setting 
(x + 0.0472972973) equal to 0.311177809 and -0.311177809.

Subproblem 1

x + 0.0472972973 = 0.311177809 Simplifying x + 0.0472972973 = 0.311177809 Reorder the terms: 0.0472972973 + x = 0.311177809 Solving 0.0472972973 + x = 0.311177809 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0472972973' to each side of the equation. 0.0472972973 + -0.0472972973 + x = 0.311177809 + -0.0472972973 Combine like terms: 0.0472972973 + -0.0472972973 = 0.0000000000 0.0000000000 + x = 0.311177809 + -0.0472972973 x = 0.311177809 + -0.0472972973 Combine like terms: 0.311177809 + -0.0472972973 = 0.2638805117 x = 0.2638805117 Simplifying x = 0.2638805117

Subproblem 2

x + 0.0472972973 = -0.311177809 Simplifying x + 0.0472972973 = -0.311177809 Reorder the terms: 0.0472972973 + x = -0.311177809 Solving 0.0472972973 + x = -0.311177809 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0472972973' to each side of the equation. 0.0472972973 + -0.0472972973 + x = -0.311177809 + -0.0472972973 Combine like terms: 0.0472972973 + -0.0472972973 = 0.0000000000 0.0000000000 + x = -0.311177809 + -0.0472972973 x = -0.311177809 + -0.0472972973 Combine like terms: -0.311177809 + -0.0472972973 = -0.3584751063 x = -0.3584751063 Simplifying x = -0.3584751063

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2638805117, -0.3584751063}

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