8x^2+12x-7=0

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Solution for 8x^2+12x-7=0 equation:


Simplifying
8x2 + 12x + -7 = 0

Reorder the terms:
-7 + 12x + 8x2 = 0

Solving
-7 + 12x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-0.875 + 1.5x + x2 = 0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + 1.5x + 0.875 + x2 = 0 + 0.875

Reorder the terms:
-0.875 + 0.875 + 1.5x + x2 = 0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + 1.5x + x2 = 0 + 0.875
1.5x + x2 = 0 + 0.875

Combine like terms: 0 + 0.875 = 0.875
1.5x + x2 = 0.875

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 0.875 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 0.875 + 0.5625

Combine like terms: 0.875 + 0.5625 = 1.4375
0.5625 + 1.5x + x2 = 1.4375

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 1.4375

Calculate the square root of the right side: 1.198957881

Break this problem into two subproblems by setting 
(x + 0.75) equal to 1.198957881 and -1.198957881.

Subproblem 1

x + 0.75 = 1.198957881 Simplifying x + 0.75 = 1.198957881 Reorder the terms: 0.75 + x = 1.198957881 Solving 0.75 + x = 1.198957881 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 1.198957881 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 1.198957881 + -0.75 x = 1.198957881 + -0.75 Combine like terms: 1.198957881 + -0.75 = 0.448957881 x = 0.448957881 Simplifying x = 0.448957881

Subproblem 2

x + 0.75 = -1.198957881 Simplifying x + 0.75 = -1.198957881 Reorder the terms: 0.75 + x = -1.198957881 Solving 0.75 + x = -1.198957881 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -1.198957881 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -1.198957881 + -0.75 x = -1.198957881 + -0.75 Combine like terms: -1.198957881 + -0.75 = -1.948957881 x = -1.948957881 Simplifying x = -1.948957881

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.448957881, -1.948957881}

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