4x^2+12x-7x-64=

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Solution for 4x^2+12x-7x-64= equation:


Simplifying
4x2 + 12x + -7x + -64 = 0

Reorder the terms:
-64 + 12x + -7x + 4x2 = 0

Combine like terms: 12x + -7x = 5x
-64 + 5x + 4x2 = 0

Solving
-64 + 5x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-16 + 1.25x + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 1.25x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + 1.25x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 1.25x + x2 = 0 + 16
1.25x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
1.25x + x2 = 16

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 = 16 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 16 + 0.390625

Combine like terms: 16 + 0.390625 = 16.390625
0.390625 + 1.25x + x2 = 16.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 16.390625

Calculate the square root of the right side: 4.048533685

Break this problem into two subproblems by setting 
(x + 0.625) equal to 4.048533685 and -4.048533685.

Subproblem 1

x + 0.625 = 4.048533685 Simplifying x + 0.625 = 4.048533685 Reorder the terms: 0.625 + x = 4.048533685 Solving 0.625 + x = 4.048533685 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 = 4.048533685 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 4.048533685 + -0.625 x = 4.048533685 + -0.625 Combine like terms: 4.048533685 + -0.625 = 3.423533685 x = 3.423533685 Simplifying x = 3.423533685

Subproblem 2

x + 0.625 = -4.048533685 Simplifying x + 0.625 = -4.048533685 Reorder the terms: 0.625 + x = -4.048533685 Solving 0.625 + x = -4.048533685 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 = -4.048533685 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -4.048533685 + -0.625 x = -4.048533685 + -0.625 Combine like terms: -4.048533685 + -0.625 = -4.673533685 x = -4.673533685 Simplifying x = -4.673533685

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.423533685, -4.673533685}

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