64x^2+16x-11=0

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Solution for 64x^2+16x-11=0 equation:


Simplifying
64x2 + 16x + -11 = 0

Reorder the terms:
-11 + 16x + 64x2 = 0

Solving
-11 + 16x + 64x2 = 0

Solving for variable 'x'.

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

Divide each side by '64'.
-0.171875 + 0.25x + x2 = 0

Move the constant term to the right:

Add '0.171875' to each side of the equation.
-0.171875 + 0.25x + 0.171875 + x2 = 0 + 0.171875

Reorder the terms:
-0.171875 + 0.171875 + 0.25x + x2 = 0 + 0.171875

Combine like terms: -0.171875 + 0.171875 = 0.000000
0.000000 + 0.25x + x2 = 0 + 0.171875
0.25x + x2 = 0 + 0.171875

Combine like terms: 0 + 0.171875 = 0.171875
0.25x + x2 = 0.171875

The x term is 0.25x.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25x + 0.015625 + x2 = 0.171875 + 0.015625

Reorder the terms:
0.015625 + 0.25x + x2 = 0.171875 + 0.015625

Combine like terms: 0.171875 + 0.015625 = 0.1875
0.015625 + 0.25x + x2 = 0.1875

Factor a perfect square on the left side:
(x + 0.125)(x + 0.125) = 0.1875

Calculate the square root of the right side: 0.433012702

Break this problem into two subproblems by setting 
(x + 0.125) equal to 0.433012702 and -0.433012702.

Subproblem 1

x + 0.125 = 0.433012702 Simplifying x + 0.125 = 0.433012702 Reorder the terms: 0.125 + x = 0.433012702 Solving 0.125 + x = 0.433012702 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = 0.433012702 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = 0.433012702 + -0.125 x = 0.433012702 + -0.125 Combine like terms: 0.433012702 + -0.125 = 0.308012702 x = 0.308012702 Simplifying x = 0.308012702

Subproblem 2

x + 0.125 = -0.433012702 Simplifying x + 0.125 = -0.433012702 Reorder the terms: 0.125 + x = -0.433012702 Solving 0.125 + x = -0.433012702 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.125' to each side of the equation. 0.125 + -0.125 + x = -0.433012702 + -0.125 Combine like terms: 0.125 + -0.125 = 0.000 0.000 + x = -0.433012702 + -0.125 x = -0.433012702 + -0.125 Combine like terms: -0.433012702 + -0.125 = -0.558012702 x = -0.558012702 Simplifying x = -0.558012702

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.308012702, -0.558012702}

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