x=-16x^2+11x+7.5

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Solution for x=-16x^2+11x+7.5 equation:


Simplifying
x = -16x2 + 11x + 7.5

Reorder the terms:
x = 7.5 + 11x + -16x2

Solving
x = 7.5 + 11x + -16x2

Solving for variable 'x'.

Reorder the terms:
-7.5 + x + -11x + 16x2 = 7.5 + 11x + -16x2 + -7.5 + -11x + 16x2

Combine like terms: x + -11x = -10x
-7.5 + -10x + 16x2 = 7.5 + 11x + -16x2 + -7.5 + -11x + 16x2

Reorder the terms:
-7.5 + -10x + 16x2 = 7.5 + -7.5 + 11x + -11x + -16x2 + 16x2

Combine like terms: 7.5 + -7.5 = 0.0
-7.5 + -10x + 16x2 = 0.0 + 11x + -11x + -16x2 + 16x2
-7.5 + -10x + 16x2 = 11x + -11x + -16x2 + 16x2

Combine like terms: 11x + -11x = 0
-7.5 + -10x + 16x2 = 0 + -16x2 + 16x2
-7.5 + -10x + 16x2 = -16x2 + 16x2

Combine like terms: -16x2 + 16x2 = 0
-7.5 + -10x + 16x2 = 0

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

Divide each side by '16'.
-0.46875 + -0.625x + x2 = 0

Move the constant term to the right:

Add '0.46875' to each side of the equation.
-0.46875 + -0.625x + 0.46875 + x2 = 0 + 0.46875

Reorder the terms:
-0.46875 + 0.46875 + -0.625x + x2 = 0 + 0.46875

Combine like terms: -0.46875 + 0.46875 = 0.00000
0.00000 + -0.625x + x2 = 0 + 0.46875
-0.625x + x2 = 0 + 0.46875

Combine like terms: 0 + 0.46875 = 0.46875
-0.625x + x2 = 0.46875

The x term is -0.625x.  Take half its coefficient (-0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
-0.625x + 0.09765625 + x2 = 0.46875 + 0.09765625

Reorder the terms:
0.09765625 + -0.625x + x2 = 0.46875 + 0.09765625

Combine like terms: 0.46875 + 0.09765625 = 0.56640625
0.09765625 + -0.625x + x2 = 0.56640625

Factor a perfect square on the left side:
(x + -0.3125)(x + -0.3125) = 0.56640625

Calculate the square root of the right side: 0.752599661

Break this problem into two subproblems by setting 
(x + -0.3125) equal to 0.752599661 and -0.752599661.

Subproblem 1

x + -0.3125 = 0.752599661 Simplifying x + -0.3125 = 0.752599661 Reorder the terms: -0.3125 + x = 0.752599661 Solving -0.3125 + x = 0.752599661 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = 0.752599661 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = 0.752599661 + 0.3125 x = 0.752599661 + 0.3125 Combine like terms: 0.752599661 + 0.3125 = 1.065099661 x = 1.065099661 Simplifying x = 1.065099661

Subproblem 2

x + -0.3125 = -0.752599661 Simplifying x + -0.3125 = -0.752599661 Reorder the terms: -0.3125 + x = -0.752599661 Solving -0.3125 + x = -0.752599661 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = -0.752599661 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = -0.752599661 + 0.3125 x = -0.752599661 + 0.3125 Combine like terms: -0.752599661 + 0.3125 = -0.440099661 x = -0.440099661 Simplifying x = -0.440099661

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.065099661, -0.440099661}

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