64x^2+80x+15=0

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Solution for 64x^2+80x+15=0 equation:


Simplifying
64x2 + 80x + 15 = 0

Reorder the terms:
15 + 80x + 64x2 = 0

Solving
15 + 80x + 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'.
0.234375 + 1.25x + x2 = 0

Move the constant term to the right:

Add '-0.234375' to each side of the equation.
0.234375 + 1.25x + -0.234375 + x2 = 0 + -0.234375

Reorder the terms:
0.234375 + -0.234375 + 1.25x + x2 = 0 + -0.234375

Combine like terms: 0.234375 + -0.234375 = 0.000000
0.000000 + 1.25x + x2 = 0 + -0.234375
1.25x + x2 = 0 + -0.234375

Combine like terms: 0 + -0.234375 = -0.234375
1.25x + x2 = -0.234375

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 = -0.234375 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = -0.234375 + 0.390625

Combine like terms: -0.234375 + 0.390625 = 0.15625
0.390625 + 1.25x + x2 = 0.15625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 0.15625

Calculate the square root of the right side: 0.395284708

Break this problem into two subproblems by setting 
(x + 0.625) equal to 0.395284708 and -0.395284708.

Subproblem 1

x + 0.625 = 0.395284708 Simplifying x + 0.625 = 0.395284708 Reorder the terms: 0.625 + x = 0.395284708 Solving 0.625 + x = 0.395284708 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 = 0.395284708 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 0.395284708 + -0.625 x = 0.395284708 + -0.625 Combine like terms: 0.395284708 + -0.625 = -0.229715292 x = -0.229715292 Simplifying x = -0.229715292

Subproblem 2

x + 0.625 = -0.395284708 Simplifying x + 0.625 = -0.395284708 Reorder the terms: 0.625 + x = -0.395284708 Solving 0.625 + x = -0.395284708 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 = -0.395284708 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -0.395284708 + -0.625 x = -0.395284708 + -0.625 Combine like terms: -0.395284708 + -0.625 = -1.020284708 x = -1.020284708 Simplifying x = -1.020284708

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.229715292, -1.020284708}

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