x=-16x^2+96x+640

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Solution for x=-16x^2+96x+640 equation:


Simplifying
x = -16x2 + 96x + 640

Reorder the terms:
x = 640 + 96x + -16x2

Solving
x = 640 + 96x + -16x2

Solving for variable 'x'.

Reorder the terms:
-640 + x + -96x + 16x2 = 640 + 96x + -16x2 + -640 + -96x + 16x2

Combine like terms: x + -96x = -95x
-640 + -95x + 16x2 = 640 + 96x + -16x2 + -640 + -96x + 16x2

Reorder the terms:
-640 + -95x + 16x2 = 640 + -640 + 96x + -96x + -16x2 + 16x2

Combine like terms: 640 + -640 = 0
-640 + -95x + 16x2 = 0 + 96x + -96x + -16x2 + 16x2
-640 + -95x + 16x2 = 96x + -96x + -16x2 + 16x2

Combine like terms: 96x + -96x = 0
-640 + -95x + 16x2 = 0 + -16x2 + 16x2
-640 + -95x + 16x2 = -16x2 + 16x2

Combine like terms: -16x2 + 16x2 = 0
-640 + -95x + 16x2 = 0

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

Divide each side by '16'.
-40 + -5.9375x + x2 = 0

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -5.9375x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -5.9375x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -5.9375x + x2 = 0 + 40
-5.9375x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-5.9375x + x2 = 40

The x term is -5.9375x.  Take half its coefficient (-2.96875).
Square it (8.813476563) and add it to both sides.

Add '8.813476563' to each side of the equation.
-5.9375x + 8.813476563 + x2 = 40 + 8.813476563

Reorder the terms:
8.813476563 + -5.9375x + x2 = 40 + 8.813476563

Combine like terms: 40 + 8.813476563 = 48.813476563
8.813476563 + -5.9375x + x2 = 48.813476563

Factor a perfect square on the left side:
(x + -2.96875)(x + -2.96875) = 48.813476563

Calculate the square root of the right side: 6.986664194

Break this problem into two subproblems by setting 
(x + -2.96875) equal to 6.986664194 and -6.986664194.

Subproblem 1

x + -2.96875 = 6.986664194 Simplifying x + -2.96875 = 6.986664194 Reorder the terms: -2.96875 + x = 6.986664194 Solving -2.96875 + x = 6.986664194 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.96875' to each side of the equation. -2.96875 + 2.96875 + x = 6.986664194 + 2.96875 Combine like terms: -2.96875 + 2.96875 = 0.00000 0.00000 + x = 6.986664194 + 2.96875 x = 6.986664194 + 2.96875 Combine like terms: 6.986664194 + 2.96875 = 9.955414194 x = 9.955414194 Simplifying x = 9.955414194

Subproblem 2

x + -2.96875 = -6.986664194 Simplifying x + -2.96875 = -6.986664194 Reorder the terms: -2.96875 + x = -6.986664194 Solving -2.96875 + x = -6.986664194 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.96875' to each side of the equation. -2.96875 + 2.96875 + x = -6.986664194 + 2.96875 Combine like terms: -2.96875 + 2.96875 = 0.00000 0.00000 + x = -6.986664194 + 2.96875 x = -6.986664194 + 2.96875 Combine like terms: -6.986664194 + 2.96875 = -4.017914194 x = -4.017914194 Simplifying x = -4.017914194

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.955414194, -4.017914194}

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